my experience...
last new boat I bought was at a different dealer. my dealer paid a grand to have the other dealer release the boat. I know it wasn't listed in the msrp or build sheet but I know that my dealer didn't eat the entire grand. I'm sure I paid part of it. end of the day I got a killer deal on the boat and felt good walking away so it was a win all the way around.

I do not believe that this is the case in all situations.