I (along with many others) got banned 6 years ago and didn't get back in until they had their computer system revision two years later. Got a snarky letter from TLG lecturing me that LEGO was for children, not adult resellers. It even stated that I was banned from their stores. Of course, they couldn't enforce this in the US but I couldn't use a VIP card. As a matter of fact, I lost close to $300 in VIP points at the time. When I called the US CS to plead my case, they flat out told me that I was caught because I used the same email address at both Amazon (as a seller) and ebay. Of course, my next question was "How the hell do you know what email that I use at those sites?" They declined to answer.
I think about that whole "LEGO is for children" crap every time that they release another 18+ or $500+ set.