He uses poorly thought through methods, I've listened to his "methods",  Thus, he has the high amount of  Due On Sale called in a short period of time. 

90% is pretty high.

My firend once had a client who did a high end remodel in a somewhat modest neighborhood.

Lessons learned is not to buy a property with a high HOA.

I would highly recommend you create an LP agreement.

I have sold in California, took the cash and moved out of state (to Indiana) and highly regretted it - I didn't have a real estate investor mindset then.

I can say in Detroit the wholesaler your talking to has most likely found that deal from 2-3 other wholesalers, they literally have to payout 2 - 3 other parties to get the deal and this is what the fees are high and the deal makes no sense.

I talk to so many people who regret not getting a PM up front because they are having problems or high eviction rates doing it alone.

I would highly recommend sticking to the 30 year option or not doing it at all. 

@Nick HulmeMaking improvements to your primary to make it high quality enough to rent above market rents, rent it.