For that much they could have replaced the Freightliner-sourced front seats-
You can find the actual Mercedes badged vans in the US, I've seen a few at the Dodge dealership across the street from the shop. There are a couple private schools in this area, and one uses a black-on-black Mercedes bus with what almost look like AMG rims, and if the windows were any darker it'd be a panel van. You can feel the pretentiousness coming before the thing is in sight. Heck, the driver wears a nicer suit than I wear to church.
That thing on ebay, though- If you want a private jet, get a damned jet. At that price, you could rent one for a year, or get chartered flights everywhere you go. Not a big deal.