I have reviewed this same scenario on several properties and I hate to be honest but here were my results.
1. There has to be a HUGE amount of equity in the beginning to make the deal even possible on paper and below is why.
2. Rates/points etc cut deeper into the profit margin with HML's
3. Note buyers want a discount on the note so minus some more equity from your pocket
4. Buying/selling costs (closings, advertising, time to find a qualified buyer and still make the payments, ins, taxes, maintenance, etc) would play a factor so minus that from the equity spread
5. IF for some reason you didn't keep a qualified buyer in the property long enough to sell the note what would be your other exit strategy? If your buyers defaulted right before your short loan terms expired, then what? Only you can answer this b/c of your finances
I have asked myself every one of these questions HOPING I could justify doing the same type of deal but so far the #'s have never worked due to the amount of equity needed and the terms/costs involved.
I hope someone else can shed more light on this actual scenario who has experienced it!!!! I would love to know more myself how you could make this work. Best of luck on your quest and sorry it wasn't a positive note!