Mine is fear, I will prefer to cash out than to end up losing everything when I am open to win a bet and everything turn out to be loss, in some conditions, if we are able to manage the risk attached, maybe the condition couldn't have been more worst than we had, I also understand that many of us want something better and bigger and this make us to go for the higher risk an eventually end up losing everything by the end.
OR, winning with a big multiplier on your bet. But I see what you mean. Of course, cashing out a lesser amount than your bet was, in a situation like this:

is a bit on the stupid side, but when you are proposed to cash out 42x of your bet, like I was once, it's hard to resist. And I did cash out, only to find out the next day that I would have won 200x.