But see... the real point is not to get product out there on the market as cheaply as possible. As a matter of fact... it's to get product out on the market as expensive as possible that people are still willing to pay for.
That's the sweet spot you look for... the delicate pivot point that is going to bring in the most money while still getting most people to buy it. That's why the D&D core books were $50... because they knew they could charge $10 to $15 more than other company's books for the same page count because players were going to be willing to spend that extra cash for the D&D name. By the same token... they charge larger prices for official D&D adventures than what indy one-or-two person companies charge for adventures because they KNOW players want the "official" stuff.
Hell... we have huge threads right here on the boards (some of them started by yourself) complaining about the fact that WotC isn't putting out more material for the game. So you're demanding higher-priced product rather than just picking up cheaper, PDFd, already available material *precisely* because you want the D&D name slapped on it. So of course they're going to charge you more than just a couple quid for it, because you're demanding to pay for it.