By a strange coincidence, I had to replace a Moen faucet in an CCD yesterday. I looked at the price sticker, and decided I needed to go get a velvet cushion to carry it out to the trailer. The reason I am bringing this up: Our cost was 81% of the amount on the sticker. We got it from Airstream, and after doing a little research, I found the same, or nearly identical, faucets for about half that price. So, the huge price may not be all the dealer's doing. If Airstream charged them, say, $350, and they used even a below-standard markup ratio, it would be the price quoted.
Long story short, in many cases the high price is not something the dealer has absolute control over.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.