Personally, I abhor Walmart. The commercials make me sick, the customer service there is... well... let's just say it's lacking. However, when they offer me a book at about half-price, I take it. For the price of the three core books, the ELH, and shipping, I could buy the three core books at my FLGS, which isn't very F'ing friendly.
You see, my local gaming store believes that miniature gaming and CCG gaming is the end-all be-all, and when I ask them about books they have on their shelves, I usually get a blank stare or an uncertainly pointed finger towards the D&D section. I don't ask them what the books are like, I merely ask if they carry them, because I know five times as much about upcoming releases as they do.
Not all gaming stores support the RPG community. However, a mass-market company such as Walmart selling these products and making them more readily available to the public, they are supporting the community.
Oh, and I picked up my copy of the Book of Vile Darkness at my local Walmart. It was shrink-wrapped, stickered, but wasn't censored down to the Book of Vile Unfriendliness.