My thoughts exactly my friend. I only have 2 human toons one is in his 40s and the other is in her teens. Pretty obvious i dont play them often lol. To contrast my main is a night elf and shes 85 ^_^

I think that one factor might be familiarity. For me, WoW was my first MMO. When I was first creating a character, there were several knobs to tweak and a lot of things that I didn't know about yet.

Choosing a human reduced some of the unknowns for me (or at least I thought I did). Because the race was more familiar to me, I made the assumption that there would be things about it that I could take for granted. So choosing a familiar race was my way of trying to reduce the amount of "newness" that I was exposing myself to.

My second toon was a gnome, and my third toon was a night elf. But my first toon, which happens to be my main, was a human.

I know...without a different appearance, I just feel like WoW is all shooting fireballs and killing dragons, like my regular human life. Blue skin? Now it feels like a fantasy. ;)

One word: Racials. Diplomacy and EMFH are just godlike.