It's simple. I'm smarter than the average Joe Experience > google. You can speculate and assume all you want, but I'm not going to divulge how it's done. If someone figured it out, it still wouldnt help them because then they would understand why it is the way it is and that no amount of mucking with hardware/virtualware/etc would do any good. The smart ones will eventually figure it out and know that only a small percentage of the population would even be able to pull it off. It wouldnt be worth the hassle lets just put it that way. It would cost to much money.
Well if spoofing hardware don't work something must be left behind on a PC when installed.... or some type of list to everyone is ban till unbanned.
So, all honesty First step new OS, NEW IP, VM or Different machine should work. Just slowed them down really, strict account you slowed them down twice now per ban. It doesn't matter what is designed it can be bypassed.