Is this still about VW dealerships, or just garages in general?
My previous vehicle was serviced at local independents. One of them lost the service book with its full history from new - it was only returned after I insisted that he rang every other client from that day, and sure enough, he'd put it in somebody else's car. The next garage I tried passed the MoT but with an advisory for the FNS shock absorber (leaking oil). Took it back to him a week later to get it changed, and when I got home and had a peak, discovered he'd changed the FOS instead. When I returned, he still had the (passable) shocker that he'd removed, so he put that on the NS. Needless to say, the following year there was an advisory for the FNS again - which of course made the history look as if I hadn't bothered fixing it first time round - not a great sign for potential buyers looking to see how much care you've taken of your vehicle.
Having invested a king's ransom in buying the van new, I'm happy to pay for a VW service history, at least while it's under warranty. It may cost a bit more than an independent, but I consider it just part of looking after my investment. I know when I was looking at 2-3 year old vans for sale, a van with VW FSH would have swayed me over one without.
Oh, and did I mention, VW Van centre Liverpool supply unlimited free hot drinks, WiFi, clean toilets, & comfortable seating areas? A very different experience to my local independents!