An undiclosed amount of coins will make a statue open up a slot and drop anything from 10 silvers to 1 golden crown. There are eight statues for every north, south, east, and west combination, and the prizes are swapped nightly.
The weight needed to drop a statue is changed monthly.
Among other things, there are mental-placebo bracelets that makes you feel luckier, only in the presence of a Chance statue. It really does nothing, but yeah, there's your scam for all the other temples too...
What else? Donating excessive amounts of crowns will begin to open up hidden services at Chance temples, such as access to private seats, a kickstarter for political power, an opportunity to become a Chancer...