I agree that the reason that a person enters the ministry should not be for money and in most cases they would be in for a horrible suprise if that was their motive. However to say that the Bible teaches the minister should not be paid (receive a salary) is wrong.
Mark 6:7 And he called unto him the twelve, and began to send them forth by two and two; and gave them power over unclean spirits;
8 and commanded them that they should take nothing for their journey, save a staff only; no scrip, no bread, no money in their purse:
9 but be shod with sandals; and not put on two coats.
10 And he said unto them, In what place soever ye enter into an house, there abide till ye depart from that place.
1Co 9: 4 Have we not power to eat and to drink?
5 Have we not power to lead about a sister, a wife, as well as other apostles, and as the brethren of the Lord, and Cephas?
6 Or I only and Barnabas, have not we power to forbear working? 7 Who goeth a warfare any time at his own charges? who planteth a vineyard, and eateth not of the fruit thereof? or who feedeth a flock, and eateth not of the milk of the flock?
13 Do ye not know that they which minister about holy things live of the things of the temple? and they which wait at the altar are partakers with the altar?
1Co 9:14 Even so hath the Lord ordained that they which preach the gospel should live of the gospel.
2 Corinthins 11:7 Have I committed an offence in abasing myself that ye might be exalted, because I have preached to you the gospel of God freely? 8 I robbed other churches, taking wages of them, to do you service.