Originally posted by weeminer
Another method, if you don't like to keep funds at sportsbooks, would be to follow a similar concept, but one layer abstracted. Maintain your bankroll in your middle man wallet and deploy funds from there. You'll still pay transaction fees whenever you decide to deposit/withdraw between sportsbooks and your wallet, but at least you won't be doubling/tripling those fees by going all the way to your bank.
I use a combination of the above 2 strategies. The higher my confidence in the security and integrity of a particular sportsbook, the more money I'm willing to keep in play there. For sportsbooks that I have little faith in, I pull my bankroll back into my wallet and keep it there until I need it to be in play again.
Basically, just minimize the frequency of your movement of funds. If you're playing with money that you can afford to lose and practicing good bankroll management, as you should be, then the constant back and forth from bank to bookie should be unnecessary.