Hm...let's see here...
Red is a nice a color, and we can all agree that the only other reason why one would join it would be for the slimest hope that one could become the con-...No...let's leave it at that shall we?
Green...oh yes...green...because it isn't red, less people will join green, therefore meaning that I will have a much higher chance of becoming the co - oops! Nope. Not going to say anymore. But, on the upside, at least I get to levitate across an empty, greenish, surreal world in an out-of-body experience...
Blue, hm. Blue is also a nice color. We can also agree that the blues are very nice magicians, which comes with many, many benefits. Teleportation! Instant tasty food! Rainbows! (Does the magic deal come with forced-love spells? Hm...I'll have to explore that one). But on the downside, there's no papa Malygos to pop jokes and be funny, instead were stuck with this love-sick boy for our team leader.
Bronze...well; it's highly unlikely that Mr. Serious Nordormu would ever let me run off with time traveling powers. So basically...just the slim possibility of getting one of his great-great-grand daughters a run.
Black - Well, I'd have to move to Outland, which as of Cataclysm is pretty much deserted, dry, and uninteresting. Would have the benefit of knowing everyone in the small flight, and would have the highest chance possible to uh...um...you know.
Infinite - Hey! At least I get the benefit of running off and changing my destiny and all that, right? I mean, it's not like I'm gonna go back in time and become my own grandfather or anything like that...
Netherwing sounds more awesome: Not only do you get all the cool powers dragons get, but you can travel across multiple dimmensions! It's like being both an Ethereal and a dragon! Plus, you get a very high chan- okay okay! I will shut up about my fantasies now!
Twilight - are there any left? Well, if there, I might just be tempted to walk up and ask to become a dragon-vampire thingy...oh! And one of the most important issues for them would be...re population. I could help in that...