Funny story...Arin probably cut them out of his life because he can't handle how much more successful they are. Mick and Tomar have way more consistent work in the industry. Even Stamper, who seems to be plagued with drug abuse and daddy issues. If that guy was more public with his nonsense, he'd probably be thread-worthy.
Plus most people find the let's plays they're featured in much funnier than the Grumps ever were.
... Stamper is in it too.