Breakfast Topic: Have you ever switched factions?

I've been a Horde player since sometime just after patch 1.3 was released in 2005. In that time, I've played both Forsaken priest and my beloved rogue, with one short intermission to play an Alliance warlock just for fun. I've had Alliance characters all along, but I never really felt the urge to make them anything other than alts — I love playing Horde, that's just how it's always been. ... until recently, that is. I seem to be having a change of heart, because I'm seriously thinking of letting my beloved rogue take a well-earned vacation, and switching to Alliance full-time for Warlords.

Why? Because I totally and completely love draenei. Really, that's about it. I loved them when they were originally introduced, but they never really had enough story with them to keep me entertained. Warlords, on the other hand, is jammed full of all kinds of draenei story so far, and I'm absolutely loving it. So I'm left with a choice, here, and I'm finding that decision really difficult to make, because I love playing Horde. I really do. It's just that right now, I'm kind of loving playing draenei a whole heck of a lot more. So I'm sitting here at a crossroads and deliberating whether I stay with my beloved faction, or go ahead and switch sides for a change of pace, at least for this expansion.

Have you ever switched factions? Is what faction you play something you consider important to you? Or is it just something you randomly do when the mood strikes you, with no regard for faction loyalty? What would make you drop the faction you're playing right now for the other side?