stuart, I think that perhaps the sim market won't pay 150$ for a very realistic dynamic campaign.
On the other hand, the gamer market, which is huge in comparison, would pay 50$ for a game that has a compelling campaign (doesn't need to be extremely realistic). ED can get their profit from quantity instead of unit price, since the cost to produce extra copies of an already-developed software is minimal.
The full-on Ka-50 sim is too hard to the casual gamer, but with the dumbed down avionics and flight model it's quite accessible. A few extra features, such as a DC, could turn it into a full-on game and make it more appealing to sim fans (and make it competitive with old games like EECH for sim/gamer hybrids like myself).