Since this thread it all but hijacked, I will throw my
in...
What's the difference between a law and a moral obligation? When you get down to the nitty gritty, pastors need to make a full time living. 1 Cor 9 says that there is a continuity between the way His ministers in the OT made a living and His ministers in the NT make a living. In the OT you had 12 tribes, one of which was the tribe of Levi. Therefore yo had basically 11 families tithing and offering to support 1 Levite family and that Levite family would make around 110% of the average of those other 11 families. The Levite would not make more than most or less than most, but just average.
If applied to the NT, you have the same thing and 11 families makes for a good church. Once you add that 12th and 13th family you have mercy for the poor as well!
In my mind, to say that people should not tithe is to say that you have a better system than God's perfect economy that He set up in the OT! If that's true, then more power to you. You will have to share it with us!