Bindox makes a good point. True, arguments about price and quality have merit, but the vast majority of pirates would still steal content even if price and quality weren't issues. Most pirates are simply too cheap to pay money for stuff. Now, I'll admit to pirating music, but I'll still go out and buy a CD if there are enough tracks to make the purchase worthwhile and I want to support that particular artist. However, I know there are people who will pirate entire albums (or even album catalogs) rather than purchase a single album. This creates an irritating cycle where companies need to increase prices to make up for lost profits, which in turn drives more people to piracy. Hmm... Well, that rant seems to have lost all direction, so I guess I'll rant about D&D now...
Now, I'm not overly fond of WotC's business practices with 4.0. They've learned from 3.0/3.5 precisely which classes, races, monsters, and settings people love, and they're making sure to mete those out carefully while providing a lot of filler. The fact that Monk- a class which is now considered by many players to be a core class- won't be in the game until PHB3 is outrageous. Meanwhile, we'll see Arcane Power, Divine Power, Adventurer's Vault 2, and the Eberron Player's Guide between now and then- and that's to say nothing of DMG2; why we need a second DMG already is beyond me. The fact that they're releasing a new Player's Guide every year is ridiculous.
I have no problems with the gameplay mechanics or the quality of 4.0. However, I do believe that they're intentionally creating as many "essential" books as possible in order to milk players for everything we're worth.