Yup & yup. Gonna use that as a jumping off point:
I think it works so well because it's just the right amount of of qualification. The standards aren't extreme enough to make me look like a delusional douchebag who's out of touch with his own SMV (I'm looking at you basic b*tches). But they're exclusive enough to make the girls who do meet the criteria, feel like they've won something, i.e. they're made to feel that they're better than other women.
I'll pick up on scarcity again. I've noticed that the best performing profiles have always been short, like really short. Long, meandering profiles reek of desperation and over-investment (says the guy posting about OLD on a seduction forum, bwahaha). Brevity is a rare skill. Protip: don't write about yourself, write about stuff.
Edit: Third reason, and maybe the most important. She doesn't have to think of an opener, I've made it incredibly easy for her to initiate. Man, you guys think there's some spergy behaviour on this forum, you should see most women trying to initiate a conversation on Bumble.