You're selling whatever you're advertising. ANY way you can get sales ethically is fair game and a good thing. You're the same as a guy who sells bulk steaks in a truck or the guy that goes door to door selling sharp knives. Pick a product, find a way to get it out to as many people as you can find who are remotely interested in it, and sell it.
I'm sorry. This thread might not last long but I see a lot of newbs not even know the basics of Internet MARKETING. I just thought I'd remind some of us what we're here for.
"Off to sell some widgets."