I was wondering what kind of bankroll most of you use when going into a video poker session?

In his book, Million Dollar Video Poker, Bob Dancer says you need 3 to 5 times the amount of the royal flush in order to play safely forever. Therefore, for a quarter machine, you'd need between $3000 and $5000.

That's a little too rich for my blood. I just usually scrounge together whatever I can, but I was wondering if anyone out there used a more scientific approach?