Targeting Private Mortgage Holders By Price Range

In the search for holders of private mortgage notes and for potential holders of same, I was wondering if there's a richer lode of prospects at a particular economic level (where the home is owner occupied). For instance, is a home seller more likely to take back a mortgage if he sold/is selling a $100K home? $250K? $500K? $1M? I was thinking of narrowing my niche to $500K and above but it occurred to me that if I could afford to have lived in a million dollar home, then I probably don't need to sell my note at a discount. Anyone have such demographic info?