I used to a mass botter in wow, one thing I picked up that's a lot of the people who have farms know is that they will show no mercy if you have multiple clients on one computer.
Works like this;
Your account get's suspected by a supervisor or staff or whoever the hell does it for blatant suspicious activity.
Guy see's more account's on your computer via hardware ID's ect, links them and bans them as well, no mercy type bans that you can't really appeal.
80% of the time they will leave you one account, for you to carry on and buy more licenses and such (more ??? for them, they're not stupid).
This is what happened to me in diablo a moment ago, 5/6 of my accounts got shot down in one go, the one was left untouched, they know what they're doing, been using the same method for years, even the glider days of botting in wow in like 07'
I only really have myself to blame for getting linked up and banned, I should of known they would use the same tactics that worked so well to combat farmers who don't mask their accounts, time to rebuild and come back stronger.