would this work in theory?

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this guy will owner finance his house which is worth 200k arv.  if i bought it for 180k and sold it for 200k i would still be making monthly payments to the owner BUT i would also have money left over because i wouldnt pay him back in full right away, i would pay him back monthly or whatever the agreement.

SO IN THEORY, would this be like taking out a loan, just with more risk and more work?

 even if i ended up losing money off this deal, i would now have money for down payments for profit, and marketing etc etc.  so in the end it would come out as me making a profit.

hope that all made sense