BMW of Arlington
I had a not so terribly different experience with BMW of Arlington. First, let me say that I work a block from BMW of Arlington's Eads Street service center, which has done me well in the past, and was fully prepared to buy my 135 convertible from them.
However, I'm not in the philanthropy business. Their price was on the high end of the spectrum of quotes from DC area dealers, a couple of thousand higher than what I ended up paying.
Along the way, the salesman I dealt with admitted that BMW of Arlington is not a high volume dealer and can't compete with some others on price. (I'm thinking that's a good way to make sure you don't ever become a high volume dealer.)
I suppose on any one transaction, anyone can match anyone else's deal. Bobby's email smells of sour grapes but my experience is that the dealership can't back it up. Don't worry about it.