There are a few ways to make money on Craigslist personals, depending on what you are willing to do. One way is to post ads as a seller, either of goods or services. Another way is to respond to ads as a buyer, and then negotiate a price for the goods or services. Finally, you could also work as a freelance writer, creating ads or posts for people who want to advertise on Craigslist but don't have the time or skills to do it themselves.