I probably have "too many kits," but a few years ago I made a deal with myself: don't buy a kit unless I have a specific plan about how to build it, and purge everything else. So while my backlog still looks ridiculous, I can go to the shelf at any moment and know what I'm going to do with any particular kit. Not only has it slowed my buying, I no longer sit in front of a newly-opened kit and vapor lock at all the possibilities.