The math is a bit more complex than that, but there is a serious stack advantage in NL games.

In some of the $1/$2 bar side games I play there's no max buy in. I buy in $100 or whatever the max stack is. If someone takes a big pot off of me I buy in over their stack. These games don't have a lot of people with actual bankrolls, so when they lose their $60 or whatever, they're gone. By the end of the night it's me, a couple other good players, and a lucky drunk guy or two cashing out 10-15 people's money.

Buy in heavy, whenever you can. Only do it when you lose a pot or something, because if you do it constantly, everyone else will do it and have the same advantage. Or worse, people will stop showing up because they can't win with just $10.