Weird, the only item I've ever bought on AMZN is a physical out-of-print book which I thought was the one thing left over from their startup phase where they got book stores behind and which they got right.
Your reasoning sounds weird but Amazon actually is a good source for out-of-print books. Another good source is a abebooks, which is also owned by Amazon, unfortunately.
My experiences buying books from Amazon have been basically positive apart from the generally poor state of on demand printing. As far as I'm concerned they do get it right.
Cynical programmers don't write about OK experiences.