Coon skins aren't worth much this year. Better than they've been last few years, but definitely not as good as they were... say 6-8yrs ago (glory days!!)
That said, in most states, it is illegal to keep and/or sell live game species without a special permit, and in that case, the permit HIGHLY regulates the sales, so "I caught a few and want to make some money from it" type of guys won't qualify.