They'll imperceptible to individual vendors, as it's distributed across thousands. "Substantial" is extrapolated from a small (but just large enough to draw str

They'll imperceptible to individual vendors, as it's distributed across thousands. "Substantial" is extrapolated from a small (but just large enough to draw strong statistical conclusions from) A/B rollout. Should Amazon charge vendors more when they identify where to invest more engineering effort, as a result of these A/B tests, which eventually lead to far higher increased revenue?