It's because the church prides itself on not having a paid ministry. I think that's silly, and paid ministries are a good idea, but in its early days the church made hay of the idea of the base minister working for satan for money, so it made its current bed.
Coggins No, actually, its a very bad idea, and its also unbiblical, which is a plus for anyone who thinks its a bad idea.
The Levites were paid from tithes and offerings. I've often seen the Levites used to justify the priesthood ban (the levites were priests), but that's also incorrect, as is Cog's assertion. Not every Levite was a priest, many were given the task of maintaining the temple, not necessarily officiating.
Each one has to find his peace from within. And peace to be real must be unaffected by outside circumstances. -Ghandi