If you rank up enough, do you get to usurp Pokemaster or something?
You can pass him in points, but that's about all you can do.
Why aren't the points shared between the three microsections of the site?
It shows your contributation to each individual section I guess.
If I want to write on someone's wall, up vote a determinate question, or even write on my personal wall, why can't I do that even if I reached the minimum points necessary in another section of the site?
I'm pretty sure this isn't intentional. If it is, someone can edit and explain.
Does that mean that I have to accumulate enough points in every section?
Yes.
So what if someone is a moderator?
They gain a ton of extra privileges, such as the ability to view special pages and the ability to ban users.
Are you a moderator only on the sections where you have reached the determinated amount of points?
Moderator isn't earned with points, they are hand picked by Pokemaster - same goes for editors like myself. If you receive a promotion, you receive it globally, so no, you don't need to earn it in each and every section. That'd be stupid.
What if a moderator doesn't have enough points in the RMT section, does he have to wait for another moterator to check and approve his question/answer?
Not sure, but I don't believe that the ability to pass moderation is included in moderator privileges, so yes, if they don't meet points requirement, their posts would have to be checked. Correct me if I'm wrong, but I guess this also means they'd be able to check their own posts for approval. ;P
What if someone reaches an absurds amount of points, say 50 thousands, does he become the NEXT Pokemaster and start ruling this site with an iron fist?
Nope. You can't overthrow Pokemaster, it seems. There are people who've reached 60k and nothing has happened. ;P