Observations, really. I might add religious clergy to the list as well.
It's pretty common for Pastor's wives to have a position in the church as well.
Very often unpaid
The Pastors I've known in my life have been dual-income households, and Megachurches are infamous for using that set-up. Though I grew up in a small town with a decent mix of residential incomes, so there was no particularly poor churches in town.