First of all, I'd like to take this opportunity to point out to the 50+ forum that the OP is NOT me, under an assumed name.
That said, I can definately relate! Although I do not share your passion for actually wrenching, and am pretty clueless about how to restore bikes, I do share your passion for craigslist and collecting. In my first year cycling, I've purchased five bikes, only one new, and that one the bottom of the line Trek MTB.
I finally thinned the herd by selling my singlespeed conversion -- and guess what -- my LBS saw the bike the other day -- the new owner brought it in to swap out the handlebars. LOL
I have a friend who's 69 years old and afraid to cycle. He has what he calls a "top of the line" fifteen year old 10-speed in his garage that he wants to give me this summer, after his nephews visit and potentially use it. He doesn't remember the brand. I'll take it, I'm sure.
It's all about having fun. If you're having fun, relax! Welcome to the Funny Farm!