Surely if they are devs they know they're not bound to the "default download".
I've been using ST3 dev builds for what, 2 years now? Rock solid all this time on OS X (with around 10 plugins). Only had one issue (high cpu load on search IIRC), that was corrected by going back to the ST3 beta for the 2-3 days it took for it to be fixed.
I'm in the same boat. I use ST3 as my primary editor and it's been quite stable.
The ST2 users are part of a significant chunk of developers who just use defaults. They use the default shell, default themes, default mail/calendar/IM client, etc. They don't toolsmith. Their motto is, "If it ain't broke, don't fix it."
Considering the annoyance of dealing with unstable software, I can't blame them... much.
I've been using ST3 dev builds for what, 2 years now? Rock solid all this time on OS X (with around 10 plugins). Only had one issue (high cpu load on search IIRC), that was corrected by going back to the ST3 beta for the 2-3 days it took for it to be fixed.