Honestly, I wouldn't be surprised if the amount of "I've never dove, but I want to be an instructor" posts on here is not reflective of the amount of people who actually consider this. The core of SB members are people (of all levels) who have a passion for diving. I think new divers on here are generally grouped into 3 categories: "I need encouragement/advice", "I want more information" and "I want to go pro", while new divers in general are probably divided into "this is not my thing", "this is fun, I'd do it again" or "this is awesome, how soon can i do it again?". The "this is awesome" group is the only one that might immediately want to go pro and they're probably the most likely to join SB.
I never considered going pro until I did my Rescue class, and even then, I'm not really sure what made me consider it. During my first session of my OW course, the instructor had us say how far we thought we'd go up the certification ladder when we introduced ourselves. At that point I figured I'd stop at AOW. Oops.
While I was doing my DM, I met someone who arrived at the shop intending to do zero-to-hero, having never done a dive in his life. I couldn't understand why. He told me all of his friends who had tried diving loved it, so he was sure he would too. Turns out he left after a week, barely finishing his OW after realizing he gets seasick really easily. I guess if diving is portrayed as being so easy that anybody can do it and that the pro lifestyle is just awesome, who wouldn't want to go pro asap, especially if you've tried it (diving) and realized that it really is awesome?