If your ideas is so good, why aren't you rich already ?
If this works then why are you telling us about it and not doing it yourself?
There are many responses, including Wilmott's response:
1. I don't have the ability to do it myself, this is my marketing pitch, want to back me?
2. Ideas are cheap, I know which ones are good or bad but not everyone can tell the difference
3. Do you know all the barriers to entry? $1million in lawyers fees to set up a fund, months of software writing, years of knocking on doors trying to raise money. Forget it!
4. This is a great idea, but I've got better
5. I don't want to spend the rest of my life doing this, even if it is profitable, variety is the spice of life
6. I did, and now I've retired or, more simply, I've got enough money already
7. My lawyer/doctor/wife says I mustn't
And, Of course, if this worked in practice I wouldn't be telling you about it.