When I'm being completely honest with myself, I'm forced to admit that one of the things holding my alts back is that I get dissatisfied with their appearance. Whether it's the limited number of options you get at the character selection screen, or just an overwhelming and completely inexplicable preference for a single character model, I always find myself thinking at some point in an alt's 20's or 30's that I'd take them back to the drawing board if I could. I deleted a level 30 Night Elf Druid in no small part because she bore an uncanny resemblance to Cher, and I am very uncomfortable both with the idea of playing Cher and Cher being able to kill people with Moonfire spam. I'm pretty close to deleting a level 30 Draenei Mage for the same reason. Well, not because she looks like Cher, but something about her appearance just....bugs me.
My main is the only character for whom I've never had that impulse, and I don't know why. Female Tauren don't have particularly interesting animations, jokes, or special attacks. They're less plausible (how on earth do they run like that?), less dramatic, and less impressive-looking in endgame armor than their male counterparts. Maybe it's just their distinctively awkward gait -- you can tell it's them from a mile away -- or just that so few people play a Hordeside female who's not a Blood Elf, but I find them hopelessly endearing.
So I keep rolling moo-cows. Or, to be accurate, a particular model. Call me boring, but no toon from my growing herd will ever be mistaken for Cher.