[gojomo]

At its heart, the "just in time mentoring" or "rent-a-mentor" aspect is interesting and might be popular.

I think the injection of impossible-to-value equity into the payment model confuses things. The kind of talent looking to pick up semi-anonymous part-time piecework over the internet wants cash, not promises of shares in some unknown startup. What you're proposing is freelancing more than founding/investing.