I want to get a general idea of how you guys raise preflop.

I see many people on here raise 3 or 4xBB +1 for each limper. But if you raise a large percentage of hands, this seems like it would get costly, plus after a while people will just call those too and you are playing much larger pots with potentially marginal hands.

I raise the same amount (4xBB) regardless of limpers about 95% of the time - mainly NOT to give any more info about my hand. If I'm raising AT, I'm not sure I want say a 6bbx3 pot to fight over. So, do I NOT raise AT? I want to have a high pfr % so opps can't tell what I have. I'm sure somebody can explain why the other way is better.