my idea was for plugin that redirects ecommerce and affiliate-able purchase/product web page links through a hub-site and inserts the site's affiliate id, tracks any original affiliate for record-keeping, collects a commission through having service accounts at each affiliate site (amazon, ebay, etc) and pays the USER a kick-back for their purchase with the site via collecting the commission on their behalf.
Realized they'd be many hurdles and technicalities, but could make a lot of money, perhaps.