Let's say you play a solid ABC TAgg 18/9 game, starting at $10NL. You decide that you will play as straight a game as possible - no bluffs at all (semi-bluffs acceptable when conditions are absolutely right), and you will fold every time someone reps a better hand than you have, and every time you are getting bad pot odds (with a small allowance for implied odds when definitely applicable).

At which stakes will this stop to be profitable, and under what conditions? For the sake of argument, let's say you will never play the same opponent twice so they will only know you through the particular table at which you meet.