Sometime back, I remember someone asking what version of Greyhawk was the real Greyhawk. I believe Gygax said that the version that YOU the individual DM and player are involved in is real to you and has the validity of any other Greyhawk.
This is all about a game, and in 22 years of gaming, I have seen most types of gamers and campaigns.
I would argue that as soon as you create an NPC, PC, location, creature, adventure that you are playing in your own version of an established campaign setting if you are using one. Indeed, many of the ideas that are incorporated into Third Edition and earlier editions have been created independently.
Back in 1983, I played a 1st Edition game at Gen Con (then at University of Wisconsin -Parkside) where the DM had us roll initiative individually using a d10. This was new. Strangely, something like this made its way into 2nd Edition.
I imagine that the input of players had something to do with the FRCS. Some may have been running their own versions of the Realms, or using Realms products in their own campaigns. To me, an "official" Realms campaign (whatever that is besides one run by Ed Greenwood or someone at WoTC), a modified FR campaign, or a completely independent creation are all equally valid role playing experiences. (My own campaign setting is 23 years old. At the risk of sounding arrogant, I do not feel that because it has not been published makes it any less valid a setting than Greyhawk, Forgotten Realms, or anything else that has been published.)
I find the contention that this site is anti-WoTC to be somewhat strange. Morrus has been invited by WoTC to participate in an online discussion. Anthony Valterra, E. Gary Gygax, Erik Mona, Monte Cook, Sean Reynolds, Jim Butler, and others who have been associated with WoTC and TSR in the past and present post here regularly. I believe that many people at WoTC regard this site highly.
I would suggest that we avoid personal attacks. I respect the right of people to defend their opinions. However, I do not think it is necessary to attack another's character or credibility. (Ideas, however, should be fair game.)
To me, the key question about gaming is: Is it fun? If something makes my game more enjoyable, I may buy it. I think the issue of enjoyment seems to be getting lost in this debate.