It can be a very rich club, and its members are all expenses paid tax free, with a lower tax bracket for 10s of thousands of disposable income.
https://en.wikipedia.org/wiki/List_of_wealthiest_organizatio...
LDS net worth 67 billion, vatican, 30 billion etc. etc.
Obviously there are extremes on the other end, but for those with 45k disposable income, who can make investments and own land, no "vow of poverty" should be assumed either.
the bureau of labor statistics lists the mean salary for clergy as $50k, with a range of $25k to $80k as well.