Originally Posted by Andy_K

This is pretty much what's been happening to me. I bought the Pinarello, which came with a really nice vintage SunTour group, but I wanted to put Italian parts on it. Then I couldn't just let those nice SunTour components sit on the shelf so I found an old Trek frame to put them on. I upgraded my main commuter recently to a Shimano RS685/Ultegra group, and now I have a totally functional set of Tiagra components looking for a home. I bought a nice vintage Austro-Daimler that somebody had turned into a fixie, but the Tiagra stuff wouldn't look right on it -- it really needs polished silver parts. While I've been looking for those on eBay/CL I keep seeing other things that I have ideas for.

This is why the S-1 addendum to the N+1 rule exists. I don't know what stops single people with lots of garage space.