As most of us active here know, all Amazon links that are posted here (at least for U.S.
amazon.com, not for Amazon in other countries, e.g.
amazon.in, etc.) are rewritten to go through
rads.stackoverflow.com, which adds in Stack Exchange's affiliate referral code so that SE earns a cut of sales in case the user clicking the link goes on to purchase the item.
Unfortunately, there were and are quite a few bugs with it, which of course require resources to track down and fix. For instance, initially, links to the above internationalized Amazon sites were also being rewritten, and in turn redirecting to the U.S. site, occasionally resulting in 404 errors since ASINs aren't global; HTTPS links weren't being converted; and more recently, links to promotions (and not specific items) are currently being rewritten when they shouldn't be, breaking those links.
How much money does SE make through this affiliate program, and is it enough to offset the resources needed to resolve the current and past bugs with it?
Maybe, if the program isn't making SE that much money, it may not be worth spending the resources to keep it intact, and perhaps it might be worth just terminating the program?