I wouldn't, do you really think it would help sell the house?
I would definitely disclose it, but I'm not sure I would do it up front or in advertising.
I'm not a Realtor. I give my Model home's listings out to the agent who brings the buyer for the last Model. It's the best way I can think of to spread the love without picking a favorite.
That said, I don't know Realtor's disclosure rules in advertising. From a Builder's perspective I've been reading the 1st DCA on
Caveat Emptor and
Caveat Venditor. I still don't know what is the correct way to market this $2,000,000 Model Home under these circumstances. It may well lean towards ClintClint's post. He's been educated in this longer than I have.