Awesome idea, I already have a bunch of single page aStores set up for different things with traffic coming from Youtube, I know it's risky but i run with scissors . Why not from Craigslist too? hehe, thanks my man!
About the referral problem:
Make sure that when you put the URL of the site to visit that you don't complete the link, even though it won't turn into a hyperlink in the ad. Example, make sure that you do it like whatever. com. The reason is it is possible to jump off the page as a referral if your visitor highlights the entire link, and instead of copy/pasting they right click it and chose to "open the link in another page" or "another tab" "another window", I know the risk may be low and I don't worry about it a lot but on some products I do.
I checked and double checked this with G analytics and they always count as a referral.
Me thinks I'll post an add or two...