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95% of sold stuff are the books I explicitly promote. The rest is all kind of weird stuff, including Harry Potter's toys, kitchen furniture, MP3 players and so on. Unfortunately, noone bought a Segway via my link yet :)
All in all, the amount of purchased goods that you do not promote depends on the volume of your clicks - the more you send, the more you get. For me, approx 1 in every 1000 unique clicks purchases something non-book related.
Again, i havent put much effort into marketing their stuff - and i havent sent that many visitors their way.
However, I am pleased that im keeping up with industry standards on cent per click! :)
i used to be an affiliate a couple of years back - might still be one. i found the commissions were a very poor return on the effort required so i gave up and removed all links. i have a couple of new information-only sites of my own to launch and might stick a few amazon book links in there. but will it be worth it? well, i won't lose anything from it and i won't make much effort with it so we'll just have to wait and see .....
If you're into ASP, drop me a line. I'd be happy to share some of my core call examples with you to get you started.