In addition, I believe that signatures and personal text can be edited on an account whilst banned. The signature for the main account could have easily been updated to say that it was banned and cannot communicate, which I expect would have been just as effective without breaking any of the terms of their ban.

I can sympathize with them and understand dogie's point, however (AFAIK) they had been warned previous to their ban that they were doing things wrong and continued to do so. The ban is deserved regardless of whether they have a business to run, and they should not be given special treatment because of it.