Right, that's why they have massive churches adorned with gold and intricate sculptures. Just because it technically isn't required to pay does not mean that years of brainwashing won't condition you to give your money away. I've only been a few times, but seeing old people queue up to give a sizable part of their pension to the church just made me sad.

Unless you live in a place with mandatory state supported church.

Where does the money come from? Religious services are generally funded by donations, and these donations are usually done in the open, whereby (from what I saw) regularly attending and not donating the expected amount would put you in a socially uncomfortable situation.