I didn't want to comment for fear of going off topic. But in my expereince I'd be surprised if there is much left after expenses, hall rent is a big one, in our case a £140 went on hiring a van for the weekend to move scenery/boards, not to mention putting out that many boards with scenery requires a good stock to be built up, even getting 2' by 4' chipboard is surprisingly expensive in the quantity we use.
Its only the fact that our staff volunteer to work the event (and the evening before) that our events are actually feasible.
In other news, I'm highly tempted to come down, like I said at Vanquish you guys support our events all the time. I didn't know when the one day we run was going to be at that point though, that and I've tons of work at the moment which tends to be weekends anyway.