If I were him, I would SHUT UP about his 15%. (I know it is a LOT of money), but most people do not like to hear that 15%. It is a if he is saying "Well, I am just smarter and richer than you peons, and I know how to do that and YOU DON'T, nah,nah,nah" Not a good sell for people out of work.
The 15% any investor pays is on top of the 25-35% already collected on his part interest in the property (retained earnings), the corporation. Just like dividends paid from the corporation, it is nearly double taxation on investment.