Ive had too many duplicates, I think 8 T2's, 7 TSSP's.... Etc.
Much of the time it's to upgrade to something better, and keeping pin money in pin money works for me.
I'm slowly getting back my "bolted to the floor" pins, partly because I'm tired of flipping games around, partly because some are really terrific and they take a lot of hard work to both buy them, and locate them again reasonably priced.