My sister taught in the Catholic school system in the Diocese of Detroit for years (she is now the assistant principal). This is a newly built middle school in a very well off area and she makes a decent living. Although, she is not married and has no children to raise. She would make a lot more working for the public school system, but she is doing it for the love of teaching her faith to children...as well as other reasons.
Now, myself on the other hand...I am the Director of Religious Education and the Youth minister at my parish. I definately am doing this for the love of the job...not the money at all!! But I also live in a much, much smaller area, we have under 100 registered families, and most people live where there is a much larger church to work at. I am a paid employee, I work full time...actually a lot more than that even, but I only get paid for 19 hours a week, which is what the church can afford.
I do know of other youth ministers or DREs who work in larger churches who make a wage that with very good money handleing skills can get by and raise a family on it....and probably a part time job on the side!! The church is not a place where you will make a lot of money, but you prosper tremendously in other ways!
Let me put it this way, my friend found out how much I make for the work I do. She was appalled and told me she could get a job for me at the local grocery store working full time and with some benefits, and making over twice what I make now. But working where I work, doing what I do, I feel that I am so much more better off and really do better, making a lot less.
I hope that makes sense, you really have to be committed to doing the work of God, the money has to come last.