lukestern:

When I ordered my last Porsche the sales guy was more of something I had to go through to put my order in, not something I needed or had any benefits from.

Bingo. I would never buy another car from a dealer if I didn't have to. People can buy all sorts of stuff without a sales person, so why not a car?

The only reason we have dealers in the US still is legacy legal reason. Automakers would kill dealers in a second if they could.