Plenty of people will be sharing season tickets or giving them to family when they cant go. I'm sure the club knows this but as long as they've got the money in the bank then who cares? If you've paid the money and want to give your season ticket to a trusted friend or brother or father etc...
The cost of your seat divided by 12 - I think that would mean the deposit is around the £30 quid mark - but I cant remember how much the Northstand seats are?