Why do you ask?
Not thinking of trying a little fare evasion are you?

hock:
I don't think that's a fair suggestion at all, it could be seen as slanderous.
It is a well advertised fact that you can buy on board Gatwick Express, so it would be very difficult to gate the station given the layout of it (although theoretically possible if they segregated it). It would be absurd to suggest that people who intend to buy on board are intending to fare evade!
Many people dislike barriers, because of the congestion and other problems that they cause. They are extremely awkward for people with lots of luggage, large groups on group tickets, people with bikes, people using ticket such as Rovers, Rangers, PTE products, etc...
And the people who man the barriers are not infrequently obstructive toward genuine passengers (e.g. denying the right for break of journey, claiming routes are invalid when in reality they don't even know what the RG is!), and they can't even do anything to the most determined dodgers as they have no powers to actually do anything.
I think most people accept, reluctantly, that they are pretty much essential on suburban railways with large numbers of people on standard tickets, but for Inter-City type stations they are inappropriate.
To even things up, I'd like to see barriers at the entrance to all motorways to ensure the users of them have valid insurance, have paid for their fuel (and not got it from some dodgy source to avoid tax), have a valid license, and a valid MOT. These barriers would operate at busy times but late at night when all the dodgy characters go on to the roads, the barriers would be let open. Anyone opposing the barriers would be labelled a tax dodger ...
