1. cold calling 3bet is kinda strong anyways
2. if you are out of position, or if you know that the original raisor is calling 3bets then by calling the 3bet you are actually increasing so much the chance of playing the aces 3way out of position (pretty bad)
3. if you are 4betting light or have a loose image you can get value by things like that and also get credit when you are bluffing
4. if you have a nit 3betting then you MUST 4bet.. and even make it huge. the guy is probably gonna have JJ+
5. if you are gonna 4bet make it expensive for smaller pairs to set mine.. if you give enough
odds for them to catch a set then the only thing 4betting does is giving them the info that (i have a premium hand so catching a set means $$)