Lodogg. how often is that really going to happen? If you have AA and they hold AK and an A comes they are going to pay you anway. You may as well bet it for them. If you hold AA and they hold KK and an A comes on the turn after you slowplayed it then you just lost a huge amount of value. If i think they have a big hand i want money in on the flop before either of the following happen

1) They suck out on me
2) An overcard comes to their overpair and they don't want to pay me any more.
3) They decide there is now only 1 card left to try to outdraw me and arent prepared to pay as much to see what it is.

If they have a strong hand on the flop then go for it. Your hand is pretty unlikely to improve, and when it does "improve" it stops the majority of hands from giving you any action.