Um, well... I haven't counted. But I know at least a dozen or so, and it's bringing in more all the time.
Trying never hurt anyone. I'd honestly worry about anyone who doesn't at least make some effort. [ Bit hypocritical -- but he's already touched so many objects in this place and nothing even so much as reacted to his Imagine Breaker, so it wasn't magic, and therefore nothing he could easily deal with. Tch. ]