Everytime someone at my 2/4 table at party says they are a pro I laugh my ass off because they're 40/5/.8. Have you considered the possibility that you're being lied to?

FWIW, I think you'd have to be very good, commeted and spend a ton of time playing low stakes poker to make a terrible living. If these guys really did play 3/6 at a casino for a living they'd be very poor.