[Siegmund]

Even at $1/2 you are still going to try to win, and win as much as you can, when you hold aces.

The only difference I can see is that if you know you are beaten (say 4 suited cards by the turn, and it's a bet and a call to you), it will often cost you less than $10 more to reach a showdown at $1/2 and sometimes at $2/4.