I guess the keyword there is "burned"! Although, I have dozens of burned discs, a few used well over a few dozen times, that have sat in my cabinet for...hmm, a good five years or so. You mustn't be storing them in a CD case, or let your closet temperatures go extreme, as the disc won't just "stop working" from sitting there.
I've only had two problems with CDs/DVDs ever - and that's firstly, letting someone else use / borrow them, and secondly, just setting the disc on my desk (gets papers thrown on it, scratched etc.), although I've still not had a CD/DVD ever fail, of my own.
I do use DTools though, as digging out the CD/DVD to play is incredibly annoying if you play many games. Thankfully, some newer games are realizing the stupidity in "requiring the disc", but that's a slow change and then you have all of the older games. Hurray for DTools! :amazed: