Been playing $50NL and am 14/5. Pretty much bet my monsters and don't bluff much at all unless villain makes it painfully obvious he is weak and scared. I have maintained a 7.5PTBB/100 winrate for 15k hands and I think it can be much better (ran into a 5k hand stretch of suckouts and donk moves due to tilt). So, to answer your question...yes, this style of play is good and very profitable for $50nl and probably even $100NL. I've been watching $100NL and see many of the same players there and the same type of play so I think I can hit 5-6BB/100 there playing this way also. Beyond that, I'm pretty sure you will run into too many aware players who won't pay you off...