Playing lots of hands at 6 max is fine.... as long as you are good enough to fold when you hit a little sumtin sumtin.

I have at times played very LAGG (loose aggressive) at 6 max or 5 max tables. Raising every button hand that is folded to me, defending every BB, etc.

Lately though, I have found it to be much more profitable to simply play super tight and get paid off with my big hands. This approach will also let me make back blinds by restealing, because I do it so infrequently it almost always works.