Generally the same type of consumer who actually takes the time to register at a fan-site or the game's company's official board, is exactly the sort of person who should be spending 5 minutes reading a wiki article. They register because they are "into" the thing enough to spend more time with it, discussing it with others. The kind of customer you're talking about is the sort of casual customer who would never spend 5 minutes posting on a board for any reason. Likewise, it's only the internet. It's only politics. It's only religion. It's only life. If you want to get right down to the random meaningless of any given thing you might as well go all the way. Nothing really matters in the end. But if you're interested enough in being a member of a message board and entering a discussion, yes, I do believe you should at least have enough background on the subject you want to discuss, if you want to add anything meaningful to the discussion.
That is a straw man argument. I said nothing about what is reasonable prerequisite work to participate on a discussion board. I was addressing only what is realistic for a company to expect of their customers.
The "casual customer" is the person that every entertainment industry (be it video games, sports, television shows etc) covets. It's who they NEED to be successful. The hard core gamers and hard core sports fans are already all in. To thrive you have to have the casual viewer/gamer or whatever the industry is.
If you cater only to the "Guild Member Guy" living in his mom's basemant with a tin foil hat on his head, and require any research/background for your product to be fun/make sense to the laymen, you WILL be looking for work soon.
As far your comparison of the triviality of video games to politics, religion (which have shaped or destroyed nations, sometimes sparking wars that have cost countless millions of lives) or the internet (only revolutionized nearly every culture on the planet), the lack of perspective is so mind boggling, I just can't fathom where to BEGIN to address it.