Apasas has an interesting economic analysis, but it may be a bit oversimplified. Suppose I own a soda-pop factory producing seltzer, cola, and cherry sodas which cost ME 5 cents, 10 cents, and 15 cents per bottle respectively to produce, and I sold each of them for a dollar a bottle. I do make a little more profit selling seltzer, but I would not necessarily have to sell three times as much cherry soda as seltzer to do equally well. I probably tried to charge more for cherry soda at first, but it got complicated and my customers wouldn't stand for it, so now I'm happy to sell any flavor I can for a dollar a pop (pun intended). The history of Desk Babes may have some similarities to my hypothetical soda-pop factory.
It's none of our business whether Rex has similar profit margins (he may even have better!). He does not need our business advice, but I'm sure he's listening intently to what interests us. Similarly, we may never know all the reasons the Desk Babe prices have come down since they were first introduced, but new products almost always get cheaper as efficiencies and economies of scale are developed, especially when my product is simply electronic data.
Before we or Totem get too involved with the economics, the technical and artistic challenges must be met. If there's a market for something, the entrepreneurs will figure out how to make a living selling us what we want to buy. If they build it, we will cum.