This is very desirable since you can comfortably live with a girlfriend/dog/whatever, and not lose comfort.Buying a SFH, building rooms, renting every room and sharing your room will almost certainly cashflow in most markets (outside of VHCOL cities).

Quote from @Randy Vincent: It depends on the market.

Due to the market appreciation during the last few years of regular payments I was able to remove the PMI from all loans except for one.

Leveraging Bob's local market expertise, we secured the property for $30,000.

Leveraging Brittany's local market expertise, we secured the property for $200,000.

All my deals are off market, no realtor involved.

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Welcome to the Ohio market!

When structured favorably, seller carried transactions can offer lower down payments, below market rates and terms and improved cash flow and cash on cash return.

It may be common in your market.