I don't ban for IDs. Period. I've met nice 13ks (although not all of them have quite mastered the controls) and 3ks that are complete starfishs because they think their ID is worth something.
I'm ID 10716 and nearly every day someone asks me if I'm an imposter or if I have a new ID or what, and the answer is no - this is my first ID. I'm a perfect example of the fact that 10ks are not all bad.
I've been banned for being a 10k twice. Without a doubt others have been banned for their IDs, and I wouldn't be surprised if several really nice, smart people were scared away from Blockland due to the unwelcome some people choose to meet them with. There is no excuse for banning based on IDs. Ever.