Our concern with a profit-sharing model is that there seems to be no practical way to enforce truthful reporting and sharing of the profits. Relying on self-reporting alone would result in a system where honest people are penalized (by having to make payouts based on their honestly reported profits) and dishonest ones are rewarded. At best, it would degenerate into a simple handout program.
If we at Zidisha had a way to provide advice and contacts that are sufficiently localized as to be useful to the entrepreneurs, we certainly would do so. However, my experience is that Western business advice is useless or nearly so to most people surviving on a dollar or two per day in Africa or Asia. The best results I have seen come about when people are connected with resources in a market system, and allowed to decide for themselves how to leverage those resources.