I'm guessing they either a) didn't read the rules b) they are complete ass-clowns who read the rules but chose to break them or c) Digital_Shubhi is correct and they tried to walk bare foot on small pieces of broken glass - ouch.
Reading through the forum will reveal it for you... there are many spammers and people who just want to prmote their sites here.
Here are some of the possible reasons. 1. They don't bother reading the rules and they just end up breaking them. 2. Duplicate Accounts 3. Scammers or Spammers 4. Noobs (well noobs tend to do all 3 items above anyways)
Actually Im not agree with this item. You can find some banned members who has more than 1 K posts here ! That's it
May be they tried doing something wrong thinking that no one would notice as they are pretty old. But they got caught.
And you've been here long enough to know why those members with +1k posts got banned? Read #1 (some has also done #2 and #3) and you'll understand why they all got banned. Having high number of post counts doesn't make you smart or at least out of the noob chain. New members can easily spam posts and reach the 1k mark in just a short period of time.