User-feedback analysis of paintersworld.co.uk undertaken via topic-sentiment-incident coding across reviewer cohorts and support tickets (last 12 months) yields a quantifiable distribution of willingness to pay and price responsiveness. Methods combined automated topic extraction, manual sentiment validation, incident tagging (late delivery, damaged goods, price complaint), price-point and discount-trigger extraction, and promotion-lift attribution with counterfactual baselines derived from periods without active coupons. For paint SKUs the WTP deciles (professionals) are: 12, 18, 24, 30, 36, 45, 60, 80, 110, 160; quartiles Q1-Q3 = 18, 36, 80. For DIY paint deciles: 6, 9, 12, 15, 20, 28, 40, 60, 85, 120; quartiles = 9, 20, 60. For tools (mixed cohorts) deciles: 4, 6, 9, 12, 18, 25, 35, 50, 75, 110; quartiles = 6, 18, 50. These distributions were partially estimated from analogous UK merchants where direct granular reporting was absent and are presented consistently with observed review price comments.
Price elasticity and promotion effects vary by segment and order-value threshold. Near the salient free-delivery threshold of 50, arc elasticity (ΔQ/ΔP over the threshold interval) for DIY orders is approximately -1.6 while the point elasticity estimated immediately below the threshold is -0.9; for professionals arc elasticity ≈ -1.1 and point elasticity ≈ -0.6. Promotion-induced lift measured against counterfactual baselines shows: 10 percent off → +7 percent conversions, 20 percent off → +18 percent conversions (95 percent CI [12%, 24%]), and a free-delivery trigger at 50 → +22 percent order incidence among marginal buyers. Cross-price substitution shares estimated from exit comments and competitor mentions allocate diverted demand as: competitor A (trade specialist) 28 percent, competitor B (big-box DIY) 21 percent, competitor C (general marketplace) 11 percent, other/indeterminate 40 percent. Bundling produces systematic uplift: kits versus single-item purchases show +26 percent AOV uplift for professionals and +41 percent uplift for DIY assemblages; collection orders exhibit 12 percentage points lower sensitivity to small coupon cadence than delivery orders. Arithmetic across segments: mean AOV professionals 82 (delivery 70 percent; collection 30 percent), DIY mean AOV 34 (delivery 55 percent; collection 45 percent). Implications favour tiered free-shipping thresholds near 50, targeted 20 percent limited-time promotions for acquisition, and persistent bundling offers for DIY kits. Limitations include residual seasonality, project-timing clustering in reviews, and the necessity of imputing some parameters from analogous merchants.