I guess the main difference between CSG and A/A is demonstrated by this thread:
http://www.project1999.com/forums/sh...d.php?t=253763
In a CSG guild that would never happen. They'd either just ask you politely if you want to help kill a dragon or figure since you're anonymous that you don't want to be bothered and leave you alone.
Although, I just realized that thread is about Rustle, which is mostly comprised of ex-A/A hardcore people. I think they just call themselves casual for cool points though.