Really? I don't feel like I play like a nit... My AggFreq at 800 hands is 26 and my AggFactor is 2.12. Those are totals. I play pretty tight and then go aggressive.
If I bet as a bluff, I should be thinking "am I getting better hands to fold? Is it likely that he will fold x% of the time to a y sized bet to make it +EV?". If I bet for value, I should be thinking "am I getting worst hands to call? Am I ahead of enough of his range that this is a good value bet?".