I guess my group kind of fits your definition of a "garage band" (although we usually refer to ourselves as four old f$%^ers in the basement of a coffee shop)
I've been with this group for a year and a half and we've played two private house parties and 1 public gig. We do have our second official gig booked for next month. We're trying to become the other type of band - the one that goes out and plays places.
Not sure if the world is ready for us, but here we come: www.flufferrocks.com
Our new drummer is just flat awesome, but he won't stay with a band that doesn't play out. So we will play out. I also want to play out, and was feeling that we needed to start playing gigs, so I'm happy that the new drummer insists on it.
My friend's band spent two years working on original music - he eventually found that at least some of the members of his band were insisting that they play out. Now they do play gigs (he and another member wanted to spend more time perfecting everything, but the others want to go play)
IME - It is very hard to find a whole band of people who will be willing to remain in a garage band long term... at least somebody in the band will insist on playing out from time to time. It's one of the biggest reasons people play music, not playing out is bound to be a deal breaker for somebody in the band eventually. YMMV