Are zombie products dragging down your ROAS?

Six checks define feed health: product approval status (aim for 98%+), GTIN and brand coverage (both present on 100% of eligible SKUs), Google product category specificity (deepest level of the taxonomy, not top-level), shipping and tax configuration per country, image quality and aspect ratio compliance, and policy-flag review for restricted categories. Missing GTINs alone can suppress impressions by 40–60% for generic-brand products because Google downgrades their ad rank. The Shopping Waste Audit runs all six checks and produces a remediation list ranked by estimated impression-share recovery per fix.

Industry benchmark Shopping CTR is 0.5–1.5% across most ecommerce verticals, compared to 3–5% for Search ads — the lower rate reflects Shopping's passive discovery model rather than direct query response. CTR above 2% is strong, below 0.5% typically indicates a feed problem (weak title, poor image, uncompetitive price) rather than a bid problem. Category matters — apparel runs 1–2%, home goods 0.5–1%, electronics highly variable. The Shopping Waste Audit benchmarks your CTR per product category against industry norms and flags below-benchmark categories for feed optimisation rather than bid increases.

Classify every SKU into three tiers using custom labels in the Merchant Center feed: Tier 1 for products meeting or exceeding target ROAS (assign custom_label_0 = 'tier1_winner'), Tier 2 for products with clicks but no conversions over 60 days (tier2_zombie), Tier 3 for products with insufficient data (tier3_test). Run each tier in its own campaign with its own budget, bid strategy, and priority — Tier 1 gets aggressive bidding, Tier 2 gets paused or tested for feed fixes, Tier 3 gets a dedicated discovery budget. Tiering prevents Smart Bidding from concentrating spend on already-popular items while starving new ones. The Shopping Waste Audit produces the exact custom label assignment for every product in your feed.

Three causes in order of likelihood: (1) the product title is generic or keyword-stuffed, so shoppers scan past it; (2) the image is low quality, dark, or shows the product in unflattering crop; (3) the price is visibly higher than competitors in the Shopping grid. Shopping is visual-first — users make click decisions in under a second based on image and price, so even a great product with a bad image will underperform. Impressions without clicks signals a presentation problem, not a targeting or bid problem. The Shopping Waste Audit identifies impression-no-click products and cross-references against competitor price data to pinpoint which of the three causes applies.

Go to Merchant Center → Products → Diagnostics, filter by status 'disapproved', and group by issue type — most disapprovals cluster into 3–5 root causes affecting many products at once (missing GTIN, image quality, policy flag, landing page mismatch, missing shipping config). Fix the root cause in your feed or catalog, resubmit, and most products re-approve within 3–7 days. Policy-flag disapprovals (medical, supplement, restricted categories) require an appeal via the Merchant Center interface and typically take 7–14 days. The Shopping Waste Audit categorises your disapprovals by root cause and estimates the revenue impact of each disapproval cluster so you know which to fix first.

Put the most search-distinguishing attributes first: brand + product type + key attribute (size, colour, model) + other attributes. 'Nike Pegasus 41 Running Shoes Men's UK 9 Black' outperforms 'Nike Running Shoes Men UK 9 Pegasus 41 Black' because Google truncates at ~70 characters and shoppers scan the first few words. Avoid promotional language ('Best', 'Top Rated', 'Free Shipping') — these do not affect ranking and waste character space. The Shopping Waste Audit scans your feed titles for structure, length, and attribute completeness and flags the titles most likely to be losing clicks to competitors.

Weekly for catalogues over 10,000 SKUs, fortnightly for 1,000–10,000, monthly for smaller catalogues — feed health decays continuously as products go out of stock, prices change, and policy flags accumulate. Shopify-connected feeds in particular drift frequently because app-based sync introduces delays and edge cases that break feed validation. Between full audits, monitor the Merchant Center Diagnostics page daily for new disapprovals. The Shopping Waste Audit can run on a scheduled cadence and email the delta from the previous audit so you only review what has changed.

Yes, especially once your account runs 500+ SKUs across margin bands of 10–50%+. High-margin products can sustain higher CPCs profitably; low-margin products cannot, and running them in the same campaign forces a blended bid that over-bids on low-margin items and under-bids on high-margin ones. Create margin-tiered campaigns using custom labels and set different target ROAS per campaign based on each tier's break-even ROAS. The Shopping Waste Audit produces a margin-tier recommendation with the correct target ROAS per tier based on your COGS data from the feed.

Four levers beyond basic feed setup: supplemental feeds that enrich product titles with high-converting keywords without changing the primary feed, promotions feed for automatic sale badges (these boost CTR by 10–20% when active), shipping speed attributes that factor heavily into Google's organic and paid Shopping ranking, and the local inventory feed for brick-and-mortar integration. Competitive CTR and conversion rate in Shopping are increasingly feed-driven rather than bid-driven — bid control alone cannot close a 2x CTR gap caused by poorer feed data. The Shopping Waste Audit checks which of these levers are active in your account and estimates the impression-share gain from enabling the missing ones.

Track three metrics daily: impression share lost to budget (above 20% means you are leaving conversions on the table), disapproval rate (above 3% indicates feed degradation in progress), and click share by performance tier (Tier 1 should absorb 60–70% of clicks). Weekly: product-level zombie emergence, search term drift, and bid competitiveness per category. Monthly: full feed health audit, competitor price comparison, and ROAS tier reassignment. The Shopping Waste Audit condenses all of this into a single daily-monitoring dashboard so you are not chasing multiple reports to spot degradation.

Three root causes: (1) product mix — budget spreads evenly across all products but only a small subset converts at target ROAS, (2) query mismatch — Shopping serves for informational or comparison queries rather than purchase-intent queries, (3) price gap — your prices are visible in the Shopping comparison panel and shoppers choose cheaper competitors. Traffic volume is not the problem; traffic quality and presentation are. The Shopping Waste Audit identifies which of the three drives your specific account's ROAS gap and quantifies the revenue impact of each.