With the POWER OF 10 the recommended bank is 40 times the amount you want to win over 10 bets.
i.e If you want to win $100 over the 10 bets or an average of $10 a race then the bank required is $4000.
If the bets get hairy just add another maximum divisor or even 2 maximum divisors to bring the bet level back to whats comfortable for you.
Betting sensibly theres not too much trouble you can get into with this plan and I have been using it since its inception.
Cheers.
darky.