I agree with some of whay bunny is saying and disagree with the rest. Yes, a big stack is a huge advantage (and if precisely why those unwilling to rebuy AND add-on shouldn not play in rebuy tourneys), but that whole bit about not leaving yourself enough funds to rebuy (or add-on), I think that's a terrible idea. What if it comes time to add-on and you want to buy don't have the money now? Anyone purposely shortchanging themselves for a rebuy tourney also shouldn't be in it, because they are playing over their bankroll.
Your are looking at 3 buy ins minimum (buy in, initial rebuy, add on), but I think a safer "average" is in the 7 neighborhood. Many times, you will get away with 5 or even just 3, but there will be that odd time or two when it takes 11+, so I think 7 is a nice conservative average to use. Your average will probably end up being less than that (more like 5), but like I said, it's conservative.
In other words, for a $3 rebuy tourney, think of it as a $20 tourney.
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