Hmmsphil: Going along with what Butts said, the idea is prediction. While there are a lot of people who "game" the site and are just trying to daytrade without actually caring that 1DKP=10K units sold, the real point is to buy and sell to make predictions as best you can. When your prediction is right, you earn more DKP so you can make more good predictions.
If you think this will not sell well, short it and then buy it back later as your form of predicting that the current price is too high.
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If you think this will not sell well, short it and then buy it back later as your form of predicting that the current price is too high.