The Face value of a ticket is set by the event organisers. Most don't pay us anything to sell their tickets, so in order to make money See has to charge a little bit on top. The ticket cost is the face value plus the booking fee. We have to do this on a per-ticket basis to cover the cost of providing a 7 days a week, 24 hours a day booking service, labour costs, credit card commissions and all the other costs associated with running our business. The actual amount we charge is negotiated with the venue or promoter for each event.
For some shows, such as those held in West End theatres, there is no booking fee - the extra shown is a restoration levy collected on behalf of the theatre.