Surprisingly, I have a hard time pointing at JUST AB or just ATS members. Up until less than a year ago, Michael was a MAJOR supporter of the ATS. Check the threads here, I lost count of the number of times he sent folks to the ATS from HERE! I so thoroughly enjoyed meeting him at the last ATS conference, that I can not wait to see him again at Acon (don't forget that bamboo!)
Debby and I and many other talk about how they are two different groups. So what, different, does not imply competition or anything negative.
I personally do only those things that support the hobby. I'm here on AB, ATS, BTS, and also Michael's arboreal tarantula list. Once the semester ends I'll be on arachnofreaks more and with the ATA... and I subscribe to Arachnoculture and soon Sklipkan.
Do I put all of this in my signature? Nope. So the ATS and it's members are here, there and everywhere... just as AB folks are all over, and all the international folks too... and all those who just stop by the sites and don't even sign up!
I think a very tiny, yet vocal minority seem to play up the "us and them" stuff. There is NO separation in the "higher" ups. I've looked for it, I searched, never have I seen it.
Go to the info, and realize that no one source will fill every gap. Rumors, smoke and mirrors and other intangible things do not lead to bred spiders, or healthy pets.