The Bankroll is jsut the beginning of your problems. Its your style of play. Your hand of JJ in position against a maniac who has raised is a definite reraise to make him make the decision preflop that he knows you are going the distance and does he want to gamble. I know this seems alot but I would have come over the top like a $20 bet if you were in late position and knowing no one would call your reraise or even put him all in. Its better to win a small pot then to lose a big one. The only time I ever cold call is if I have a maniac on my right and I am letting him bet into my AA/KK. Let a bully do the betting for you if you have the nuts but with a marginal hand like JJ you got to drop the hammer and hope he isnt holding AA KK QQ whic is pretty unlikey. And he is a maniac not an idiot, why becuase he took your stack with a set of fours.