sometimes i will leave because the increase in chips reduces their value to me. suddenly im calling 5x raises heads up with connected cards, raising utg with A9o etc.

however, to leave because you fear a bad beat is strange, so long as you were playing within proper bankroll guidelines to begin with.

that said, a big stack in a cash game is much less of a factor than say a tournament, and i hate having a huge stack against a min-buyin(s) because the implied odds are not in your favor.