I have a spreadsheet I keep with all the leads I get. Many of them I cannot do anything with for one reason or another (stopped communicating, I couldn't do what they wanted, etc). Instead of letting all these leads just go to waste I have been thinking of selling them. These are all SEO and website design leads. They are people who replied to ads I put up on Craigslist. I really don't know how much I should even ask. I've got a steady supply of these leads. Any advice would be appreciated.