I'm not sure his offer would be open to a non-Plat.
If he donated 50,000 he'd have to part with 55,585, give or take one. You then stand to win and have a pot of 83,500. If you were to donate all of that back to him and reserve 30 for admin costs, he'd receive 83,470 * .70 = 58,429. His profit would be 2,844. His hits would suffer more than that just from being four days without the funds and, of course, you'd expect some profit for yourself. It's very marginal work running loans to non-Plats and it's hard to give good references for that kind of amount.