Well, it's a strong belief of mine that anyone who calls themselves a "PUA", aside from people marketing a product, really aren't. That being said, I'm more successful than I'd say about 60% (random ass guess) of the board, so I'll answer your questions.
As for your questions:
1) What drew you to become a PUA?
Oneitising (falling in deep, frequently unrequited obsession) on a woman who was a horrible human being and pretty much did whatever she could to abuse the power she had over me. I started searching for, "how to get a girl back", and I discovered PUA.
2) How long have you been a PUA?
Just shy of three years.
3) How big a part of your life is being a PUA?
That's hard to say. I did an intense year and a half with a buddy of mine where we went out almost every night. I lived and breathed it for a while. Now it depends on my mood - I certainly have access to a far higher quantity and quality of girls than I did in the past, and a reputation for dating a lot.
4) Can there be gay men/lesbian women PUAs (or are these techniques just man>woman oriented)?
A lot of this stuff is just normal social dynamics type stuff. There's a lot that is intended only for heterosexual men though. I'd certainly say knowledge of this stuff would be useful to gay men and women, but they would absolutely have different variations.
5) What do you think the biggest misconception is about being a PUA?
As far as I can tell, the public seems to think PUA == wearing funny clothes and negging girls. If you talk to a layman, in my experience, the first thing they talk about is negging.
6) What do you think being a PUA is about at its core?
Masculinity, strong frame and abundance. Learning how to understand female communication and motivation. Figuring out correct logistics and being able to read signs from a woman.
7) Do you think there is a general “type” of person drawn to being a PUA?
In my experience, it's mostly white men in their 20s or teens who have not had a ton of luck with women in the past. I think the demographics are getting a bit broader now - the stuff is so effective that any guy who is interested in dating girls has at least a passing knowledge of it.

Is there a lot of variation between different famous PUA personalities or do they share a lot of beliefs/techniques/practices?
No idea. I learned basics and just went in-field a lot, and updated my knowledge gradually over time. As far as I know they have different personalities and styles, but a lot of the core stuff is pretty solid. I doubt a single one would say strong frame and abundance are bad.
Any other questions?