Late to the party! Yay! But who cares! \o/
Reason for me why i play miquote is pretty much like most others already have said, but i still want to say some things. Playing a human feels unbelievable boring to me, so i never play the human race in any game that has different race choices.
To say it short and blunt: Lalafells look too much like children... roegadyns are hulks, not my case :X ... elezen are out of proportion... they got closest to "i would play them too" but miquote won over them, just because i like their looks better.
So that really only left me with miquote. That was the initial thing, now after playing my main for quite a while now, im very fond of him and wouldnt change him anymore.
About the "one of a million" thing and the most played race: Despite that i feel very unique nonetheless. I play him as a scholar or intelectual, and i can count the people i met in RP who play one character as that on one hand. This is subjective, tho, there could be many out there (actually i guess everyone who plays a "non-feral" mage) its just my perception.
And if you'd look for a significant feature that seperates him from the crowd, it would be his glasses... it's HIS thing. Personally i didnt meet a single other character that wears glasses. The only other one i know myself would be antimony, and thats OOC knowledge. ^^
He's non-tribal, like many others, but that is because i tied his youth heavily to limsa Lominsa, which is a cultural melting pot like others have pointed out already.
Naih'ir said we are coming to the citys, not from them. Well, that part already got done by Sinis mother
She's a miquote who left her clan and made a fortune in Limsa as merchant. Sini'to grew up entirely in Limsa Lominsa, so he basically grew up in a cosmopolitan society/culture and therefore has these assets (what you would describe as typically hyur/RL human western culture).
So hes far from tribal traditions as he never dealt with them, but as miquote he still has to explain these to other people sometimes. ^^ (luckily he knows enough about it due to being a smartpants). Also i know about the consequences that has to him and i find that good. He already met some tribal miquote who gave him fire for being non-tribal and even being with a non-tribal seeker who "spits on tribal traditions" as they worded it. But that was some fun RP, something which i didnt encounter before. Its almost a shame that it doesnt happen more often, but i guess thats due to most people RPing non-tribals, or if they do they still are very tolerant.
edit: shit, that really got longer than i expected xD and a bit offtopic
PS: omg, i loved FF9 ^^ is my favorite