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*wagging my finger* not if we don't say so. look, you can charge whatever the hell you want - just don't be surprised if no one ponies up 25 bucks for a mediocre 32 page adventure! still, you're free to try. i think if you took a poll of consumers (you remember us, right?), you'd find that the price of RPG products is at a more or less acceptable level. some too high (like bastion press), others a bargain.
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Obviously, crap companies that charge tall dollars for crap products are going to lose their shirts. Finding the right balance is the job of the publisher. I suspect we'll see some wildly overpriced material in early attempts to define the limits, but I certainly don't think, for instance, that $50 is an unreasonable price point for a very thick full-color hardcover with the quality of something like Oriental Adventures, Wheel of Time, or the FRCS. I think half that is too much to pay for the same book on worse paper with a bad cover and black and white art.
It's all about the value a publisher provides to a prospective customer. If the customer sees a book as worth $50, the publisher has guessed right. If not, he hasn't. Ultimately, you decide not to buy his product. If enough other gamers feel the same way you do, that publisher needs to lower his prices or find a new line of work.
--Erik