Here is a great quote by Elder Wilson Thompson which I read this morning. Elder Thompson was probably the most well known minister of his era.

"Every preacher should love his Lord well enough to obey Him, feeding the flock, even if he got no money for it; nay, if it cost him all he had, and even his life beside. And the flock who were fed by him should remember that he had a right to his support from them. The duty of the church was plainly laid down, and they ought not to neglect it. The flock should be fed with doctrine, well tempered with experience and exhortation. The youngest lambs love sound doctrine if it is bright with experience; and the older sheep love experience if it is according to sound doctrine. Thus all the flock will feed together." - Elder Wilson Thompson

He espouses the perfect Biblical balance. Ministers should go and preach, regardless of financial reimbursement or support. They preach freely for the Love of Christ and His gospel. Yet, the same God Who holds ministers responsible to go and preach freely, also commands the churches to support their ministers in "carnal things," ie temporal support. In both cases, preaching freely and support of the ministry is an act of obedience to God.