I pick up bikes from the trash all the time or get them from yard sales for 20-40$. Every weekend I ride around the neighborhood only for this reason... Depending on the frame eather I rebuild them or use them for parts. I love working on bikes( sometimes more then riding).
Now does this makes me a weirdo??? Don't know, don't care... but what's for sure is that I have lots of fun and I think that is what counts the most...