system
A chat on subreddit /r/NoStupidQuestions
human
To expand on this, many churches can't even afford a full time pastor. Went to a small church for a while where the pastor would sometimes show up to deliver your pizza, because he was working as a delivery driver to make ends meet. 

A lot of these smaller churches will list the offering income in their church bulletin / program, and you'll see that they can bring between $1-3,000 a month. That has to:

1. Pay the Pastor
2. Pay the Electricity, water, and waste
3. Pay for Maintenance and Repairs on Property
4. Pay for food and events

That money goes very quickly for running and maintaining a church.
gpt
The pastor at my church growing up had two jobs and worked 7 days a week.