I chatted with killer for a bit once in wolfchat, and I'm fairly certain he's from Utah. Mormons love their tithings. He might not be Mormon, but he'd at least be well-acquainted with them. This increases the grace equity slightly.
I agree donation is a pretty odd choice for dress/plate.
I was raised Catholic, so I'd probably think communion for grace / plate. "Donation pool" doesn't feel like something I've heard much, but maybe that's just me.