It's my pleasure, you are welcome to use the image. You could even mention that the coin is on sale with this topic details 
I have actually long thought about putting a section to the site for coin sales. People could make sell listings there in a centralized place, much more organized then on this forum. then I could direct the buyers to the sellers, and take a small cut. Do you think this would be successful?
Could be, but it'll be a massive hassle having to keep updating when new coins get listed and sold.