Why do some sellers encourage buyers to destroy a good car?

[Mike Costigan]

I don't approve the destruction of restorable cars, but at least the end product is still likely to be largely Austin Seven. Our branch of the hobby doesn't usually subject cars to this sort of desecration:

https://www.carandclassic.co.uk/car/C1299827

   

Sticking a Mazda MX5 engine into a sound original Humber seems bad enough, but then tune it to the extent that the seller openly admits the drive train is not strong enough (he's already burst one diff, and is including a spare in the sale!) seems crazy to me.