A couple thoughts...
There's a big difference between joining a band when you're a new guy trying to find a niche out there, and being an old veteran who's been around the scene forever. A veteran is going to be in more of a position to pick and choose what he wants. The newbie HAS to take chances.
A lot of blue's "proven track record" etc etc etc criteria are fine for him, but it's part of his "never waste time on a startup" philosophy. Well, guess what... if there were no startups, there would be no established bands to join. SOMEBODY has to stick their neck out, take the risks, and do the extra hard work to make a startup survive and succeed and become established, so that people with "no startups" philosophy can join their band and make money without having to take any of the risks...
Those of us who are not so risk-averse, or who are new to the scene and have no choice but to take some risks (because we're asking others to take a chance on us, after all), join or start bands that aren't such a sure thing. Sometimes they pan out and sometimes they don't. I've joined groups that seemed very promising at an audition. It's only after a few months that you start to realize that the guitarist who seemed so talented really never bothers learning new music or that the singer who seemed so charming at first impression is really a d-bag once you get to know him or that nobody is going to actually pound the pavement to get gigs, no matter how big they talk. Like someone else said, it's no mystery why someone would join the wrong band - it didn't seem like the wrong band at the time. The question is why people would STAY in the wrong band.
And sometimes what the members themselves want changes over time. My first band, I just wanted some guys to jam with. After six months, the drummer and I were itching to get out and gig... and the guitarist really didn't want to do more than an occasional open mic. So we moved on.