Ticket Sales

What's going on in Perth? Why the move to using a ticketing agency such as BOCS for amateur theatre productions? Earlier this year I saw JCS at Marloo, And had to book through BOCS. The performance was oversubscribed, and extra seats were brought in and placed in the aisles. Now I see Harbour are using them for their one act season. Is it because companies can't find someone to take on the task? Surely within a clubs membership there is someone capable/willing to do it. I guess it does stop the problem of no-shows, as you have to pay upfront - is this the reason? It does add a slug to the cost of the ticket. If you're paying $100 to see Phantom, then $6 isn't much in relative terms, but on top of an $18 ticket it seems excessive. Any answers?