That is correct but, just to play devil's advocate here (although I do have a relevant point), aren't the top 4 above Gary already well aware of their awesomeness that got them there? They are firmly entrenched at the top, and deservedly so but... are there any more deserving of the top spot than The Man himself? Would the witty comments and great photoshops even matter without the game that inspired them?
When a newbie first comes to the board and discovers the xp system- and they look at the rankings, they probably think "Who the hell is THAT guy at the top?" Shouldn't their next thought be "Holy crap! That's Gary Gygax! Cool!"- instead of "What the heck is a weem?"

No offense to weem of course, he's great (as are all the Top 4) but he's no Gary Gygax.
Ultimately- yes, give xp where xp is due- that's what it's for. But for the Top 4, they know they're the top, and they earned their spot there, but... before you click that xp button you might legitimately ask, should they really be higher than Gary?