How does Xbox determine if accounts are sold?

Godlike

User is banned.
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Hello, I was wondering, how exactly does Xbox determine if people are selling accounts? Such as on here ( http://forums.xbox.com/xbox_forums/xbox_support/f/2366.aspx ), their support forums show people that have been banned for selling accounts, but I want to know what makes them able to determine this? I know there is a lot of dumb kids who send out m2af messages saying they're selling, but I also want to know what other types of ways do they determine this? Also, is there anyone who constantly sells tags but never gets banned?
 
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