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I think this is an indicator of the shelf life of the PC game market. You got to make your profits when the game first comes out and goes for full price. After that, it is all down hill.
This makes it a discouraging market to get into. After all, I am sure there are publishers taking their cut of the profits. Then the stores that do distribution must make some money. What is left over for the guy that writes the computer programs. Probably not much at all.