You want their
stack to be
deep enough to pay you ~8x your pre-
flop call.
EDIT: NOT the amount they 3-bet, but the amount you call, minus the amount the pot is currently when you call.
BUT, you're gonna need them to have a hand strong enough to
call you when you hit... so you can't assume they will
stack off against you every time you hit your
set, and you can't expect the
set to win every time, either.
So there are other reasons to want their
stack to be deeper than your minimum
implied odds dictate.
You know the rule of 2 and 4 for estimating your odds OTF, right? Count your outs, multiply by 2 for the % to hit on the turn... if you're considering an all-in call, then you multiply your outs by 4 for the % to catch on either card.
So... that's based on the fact that you
can't see roughly 50 cards. So the odds to hit 1 of 50 is 1/50 = 0.02 = 2%. See? It's just a simple math trick to acknowledge the fact that 1/50 is not too far from 1/47 or 1/46... so just take the one that's easiest to do in your head.
Now...
If you have a
PP, then you have 2
outs to
catch a
set. So take 2
outs over 3 cards (the
flop) and you get
2 (
outs) x 2 (% per out) x 3 (cards on the
draw) = 12%
12% is nearly 7.3:1 against, and damn
close to the 7.5:1 against that you actually have.
So this trick of counting your
outs to determine your % chance to hit works pre-
flop as
well. Go
ahead and use this trick to estimate your odds going
all-in pre-
flop w/ AK vs
QQ... now vs
KK...
Show me the estimate next to the
equity calc. DO IT OR I SEND MY TEAM OF HOWLER MONKEYS TO SIT ON YOUR ROOF FOR A MONTH!!!!
TL;DR
You are a 7.5:1
dog to
catch a
set OTF, when you hold a
PP. You need to get that money into the pot and
Villain wont necessarily
stack off against you every time you do... so getting 20:1 on some of those hands, or at least having the chance to, is going to help make up for the times you
catch your
set, but
don't get paid the right price to
set-mine profitably.