The 2003 Mach 1 was supposed to be limited and Ford built about 3,000 more than originally planned. Also, the car sold for more than sticker in early 2003 with no rebate. Dealers in 2004 sold below invoice and Ford offered a rebate. Was that limited production? Ford is in business to make money. The company does that by building cars people will buy not by building limited edition collectibles.
If people want enough, they will build them. Though you could argue why aren't they building more GTs right now.