Don't agree about banning photography. Especially if you've paid a big wad to get into the place. It's easy enough to be discreet, just a compact camera or phone camera, no flash.

I suspect most of the time it is really flash they want to ban, which can damaging on fabrics and artworks. But a lot of people don't seem to know how to turn the flash off, forget, or can't be bothered, so it is much simpler to ban all photography. After all, if someone holds up a camera you don't know if the flash is disabled or not until afterwards.