Full Answer

The cost-benefit calculation is straightforward. A store spending $2,000 per month on paid ads with 30% conversion data loss is optimizing campaigns on 70% of the available signal. Facebook and Google Smart Bidding algorithms require complete conversion data to function effectively. Incomplete data produces suboptimal bid decisions that compound the tracking loss into measurably wasted spend. WordPress-native server-side solutions start from $19 per month with no developer setup required. GTM server-side alternatives require 50-120 developer hours to implement, costing $6,000-$14,400 at standard agency rates. For stores without a technical team, WordPress-native solutions eliminate this barrier entirely. For stores below $1,000 per month in ad spend, the ad optimization ROI case is thinner, but the data ownership argument applies regardless: streaming first-party events to BigQuery now builds the historical archive that AI-driven segmentation and prediction tools will require in 12-24 months.