Significantly more. I've had ~630k absolute uniques since launch, currently ~2k uniques/day waiting for the Wii to be in stock. There are conversion rate considerations, click through rate considerations, etc. When it's in stock on Amazon (when the light goes green) at the retail price (non bundled, non scalped), it makes at least $10.00 per Wii sold. Best case is a bundle ($750 retail, 5%, ~$35), worst case is Sears which only pays 1%.

Is there any reason to not still have the Google banner at the top of your site? Do you do this as a benefit to your visitors, or would Adsense cannibalize your affiliate income?