Not that it already hasn't been said twenty times in this thread, but yes you need a bigger bankroll. This of it this way; you want to have extra buyins to get back in so when you take a beat (which just happens, you have to be able to absorb it and get back in the game), you can reload and win your money back (and then some)! If you recognize 100% that there is a total chip spewing maniac at your table and you don't have any money to play with him, then you're losing money by not playing. Does that make sense?