This Article is Not a Paid Placement Written by a Guest

I get contacted all the time about allowing someone to write an article on one of my websites, many times about a topic I've covered. These people either want to send me full text articles or links to articles that I can copy from another site. They never say how much they want to pay me to host their articles, and I don't really know how much to charge (if I were to do it), but I got a bit of an idea what it might be worth based on a Craigslist ad I saw. Still, I won't be offering my website to the highest bidder like the local news sites do.