I’ve taught adults about financial responsibility and you would be amazed how clueless some people are. However it usually stems from generations who didn’t have the basic skills so never were able to read or knew nothing about bank accounts much less college savings plans, etc. that they could teach their children about. it is rare to see a college graduate much less an accountant, to be this clueless. Usually a buyer does not need the seller to carry a mortgage unless they have bad credit. Was the seller also clueless?