For some people it's impossible though, I personally have been at work during the ticket release dates, and due to maximum amounts purchasable havn't been able to get friends to buy them for me.
I can see why people do it, easy money with f*ck all effort involved, I just think it's morally reprehensible to in effect blackmail fans who have been unable for whatever reason to purchase tickets as soon as they go on sale.
Edit: For genuine people who find themselves unable to attend a gig, there are a lot of websites about that will allow you to sell them on at face value, which I'm sure would not be included in any ban.