…I always buy a lot more than I play, and there are generally only a handful of those that I mix with that will make it to the ‘keepers’ folder, but I think that’s one of the luxuries of digital formats.
Being much more selective in the first place isn’t really a solution though… sometimes I’ll sit on things for a while that I’ve thought were meh the first few listens, then decide that they are fucking genius when I’ve lived with them a while (or heard somebody else play!). More often than not, these are the ones that are the keepers too.