I sold a good, but far from perfect 51 HJ to a fellow KFer,sight unseen. After he recieved it ,he called me to thank me for having accurately described the car and what it needed. We kept in touch for several years as he brought the car up "Bristol Fashion."I helped him find parts and we remain good Friends.That is the way it is supposed to work,but all too seldom does.
Some of the problem is overselling, but just as much is unrealistic expectations. I do not have an answer ,but always give and ask for lots of photos.
Last month,I visited a seller with a 53 J that he represented in glowing terms.So help me ,it resembled a WWll higgens boat salvaged from Anzio as much as an automobile!