We throw the money in the air, and what God wants, he keeps!

Depends on the religion, community, and event. For my context a prayer is between 100 MAD to 200 MAD (about 20€) but at this rate you get nice prayers.

I would say that a single unitary atomic prayer composed of a single idea single 2 to three words would be 2 MAD (0.2€ approximately).