The business model mentioned is used by many publishers in the gaming industry. Release a game with basic features and some maps/missions and release the rest of the content as dlc. Call of Duty has done it for years, Battlefield 3 does it as well.
Long gone are the days that pc gaming ruled supreme and all extra's came at no extra cost. Back then there was shelf after shelf filled with tanksims, flightsims, subsims and whatever. And all of them came with telephonebook-sized paper manuals. (M1 tank platoon, Command Aces of the deep, Total Air War, F4Fighting Falcon, Panzer Elite, European Air war, M24 Hind and many more)
Anyway I can't blame Panther Games for trying to generate some cash flow in order to keep operations going. There are some features that I would love to see in Command Ops, but accept the fact that it is probably never going to happen because resources are scarce.