My opinion on why you dont see them. Probably a mixture of colt being behind the times on dealer relations for one. Secondly as others have said less markup. Dealers will push what they make the most on. They will also convince the world that whatever they make the most on at any given time is the best there is out there.
Knowing several LGS owners and one of them used to sell for Colt there is a very complicated LGS/Colt relationship. It makes it hard for them to be a stocking Colt dealer.