kind of depends on the board and the opponent(s). against more than 1 opponent it should be played cautiously. there are some people that I will play TP like the nuts against, and others where if they are calling I will slow down on a drawless board.

I think if you are routinely betting all 3 streets strong with TPTK you are throwing away chips. if you are doing it for a specific reason, then that is different.