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I never really bothered worrying about it.

The better your competition, the thinner the edges you should take. The bigger the blinds the thinner the edges you should take. Error affects your min edge. For example some hands if your ranges are too tight even slightly your EV plummets. In others it makes much less of a difference. These types of errors are also compounded when you have to push through multiple players.

Basically at smaller stakes games(16s and lower) you can forgo a lot of small edges(0-.2 or .3%) because you gain a lot of equity from all the morons going to town with eachother and stuff.

I never really tried to quantify what minimum edge you should have in certain spots and so far as I know nobody else has either. Those who have bothered haven't come up with any definitive answer either, just speculation.