Try some spin on the classic horse race predictors on the rich, they always seem to fall for ponzi type schemes. The basic premise was send a letter saying you have a new system, here is a free bet back horse A. Horse A wins next week send another, horse wins again, another and another win. Now tips cost X amount, and they are begging for them, even if they never placed a bet yet. Of course if there are 12 runners you actually send out 12 different letters hundreds of times. Then another 12 types of letter just to the ones that got the letter with the winning horse, etc. So you need to cast a wide net at first.