What's interesting to me is that at once, this article speaks both to why a site like this SHOULD NEVER exist (you should really know your co-founder) but also why it REALLY MUST exist (some kind of reputation score could have helped here).
The risk that I see is that the problem is a latent problem (i.e. one that founders are not aware of) rather than a realized problem. So, the people who understand your value proposition are already ruined and don't have the cash to pay you and the ones who have the cash and need your service don't know that they need your service.
The immediate problem of how to match people is also non-trivial. Reputation doesn't really work in the startup field, unless you're matching serial entrepreneurs, who probably don't need your service.
It's a real problem, and it'd be great if someone could solve it, but I just don't see a business in it. I'd be happy to be proved wrong, however.