I have mixed views on this - one way of looking at it, is people aren't putting anything into the site, just using it as a free service to shift their car so lets block them. The other is, well why not have more exposure to more VW car sales on here - all helps if you are looking for a car.
The 10 messages before the pm's work was put in for that very reason of trying to get people to put something back into the site. It doesn't work very well as Chuff mentions, it just adds more junk posting much of the time.
So there you go, fence sitting answer.