I see the attraction: easy to park, possibly cheaper to run, no leaky seams, but some are way overpriced.
I have several searches running on eBay, and I'm astounded by how many vans are with Motorhome Depot these days. I'd never buy or sell with them, and I've noticed they never put more than 9 pictures in the ads, and they are often not very informative, so you have to contact them for more. I changed my number on eBay to stop them bothering me, so it's all via email.