Now then, GUEST (anonyomous)! You obviously didn't look at the link to photos of the room, which is obviously very dead, acoustically.

I have performed in 400 seater (plus) concert halls where a PA wasn't necessary, but I recently played in a very similar 200 seater hall (Allford Hall, Warrington to be precise), and was grateful a PA had been provided.

It isn't a matter of bravado, but simply if the room stops the sound in its tracks, people at the back won't be able to hear what they've paid to hear - and that is a very big problem for a club organiser.

As you mentioned a 60 cycle hum, you are from across the pond... ours is 50 cycles!!