Let's see the business side of backing for a moment, because there is a Catch 22 there. Let's assume you make 20% month after month, and you have a deal with your backer for a 50-50 split. And you also compound the gains.
The problem with any excellent trader making huge returns being backed is that after a while the trader will break free because he doesn't need more backing anymore. So you are making 10-10% compounded monthly for you and your backer. Guess what? After 7 months, you have the same amount as you were backed with at the beginning!! At that point there is no point in staying with the backer because you could just keep going at it alone and compound 20% for yourself alone, instead of getting taxed 50% (beside the income taxes later on) by your backer. This is an inherent problem of backing high return guys, not just yours...
So does your backer realize that you are going to leave him after 6-7 months?* Also, why not do it like a real man and sign up for credit cards and use that money? CCs don't take 50% per month out of your super duper system....
*If he is reading ET, I am sorry...