I have a haggard 8v with holes in the floor and rust on every panel, however, I would NEVER get rid of her. I've had her for years and gone through loads, however, I will still do an engine conversion soon. Not sure if that'll be 1.8t or highly strung 16v yet though.
It's never to do with cost as we'd all be running standard cars and own things a lot more practical than mk3s but it's an emotional thing.
Although BenVictors replied because he wants to make some money (joke), at least he responded to the OPs question.