Even VW know about it though - remember that ad they ran a few years back with the sadly modded Golfs? I wonder if these owners realise they've just probably halved the value of their car. They might spend thousands but only about 5 people would be interested in buying it.
I sold my grey MK1 Gti to a 19 year old in a nearby village 8 years ago and thought he would mess with it. But he hasn't. He looked after it and kept it as a genuine example. It looks so much nicer than some slammed, blacked-out monstrosity that makes your eyes bleed.
I helped my nephew find a nice mk2 golf gti, he spent about £5k on 'improving it' and sold it 18 months later for half what he paid for it. In original condition it would have been worth the same as he paid. Worst bit was that he threw the original stuff in the bin!!!!!!!!