Post Bans

Hey. Judging by my posts, you can tell that I'm pretty new to the site, and I have a question. I see everyone being post banned, but I don't really understand this.

Can someone please explain at what number do you get banned? For how long? And what exactly is the point of this?

Much appreciated

And I'm almost certain something like this must have been posted before, but both a Google and forum search brought nothing...

You get banned for 1337 posts, 2k, 3k, 4k... Simple as that. It's usually just a day or two. Why? It's tradition.