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[–] J_Darnley [S] 0 points 0 points (+0|-0) ago 

Possibly that. I'm sure I've read that some publishers limit the discount and how often an item can go on sale. Something may also limit this type of sale. It is more a gimmick to make people buy without thinking. Somewhat along the lines of Black Friday deals, "while stocks last" deals, and other things of that nature. Obviously they can't run out of copies since it is all digital.