Raising Preflop in Party 15/30 Games

[InternetPokerPro]

It is not uncommon in the Party 15/30 games for upwards of 40% of the players to take the flop on average.

My question is whether there is +EV to be gained from greatly increasing your preflop raising standards and simply calling more to see if you hit the flop. If it were possible to actually narrow the field w/ a PF raise I wouldn't even speculate about this. But in some of the loose Party 15/30 games that simply is not achievable.

I am not suggesting that you not raise w/ premium pairs. But I am suggesting that it might be more profitable to limp w/ AK and AQ offsuit more from middle positions if you already have a caller.

Is my conclusion flawed?