Technically, monger is not meant to be "dealer" but someone who '"deals with".   The word whoremonger in the Bible is one who “mongers” with “whores”—that is, one who involves himself with prostitutes. Whoremonger is an old-fashioned word found mainly in the King James Version and the Young’s Literal Translation of the Bible. In modern language, we would say the person is a “fornicator” or “adulterer.” Broadly speaking, a whoremonger is anyone who engages in sexual intercourse outside of marriage.

An example of the word whoremonger is found in Ephesians 5:5 in the KJV: “For this ye know, that no whoremonger . . . hath any inheritance in the kingdom of Christ and of God.” Most other translations simply say “immoral person.” The Greek word in this verse is pornos, related to porneia, from which we get the English word pornography. Essentially, all sexual immorality falls into this category, but the word changes depending on the person committing the act and his or her gender. For example, a woman who engages in sexual immorality is called a “whore” (porne) in the KJV, but a man who does the same is called a “whoremonger” (pornos).

"mongers" are also promoters or boosters, if you will. I think a fair number of board members can be considered boosters of prostitution.