Buying ad spots is better than buying traffic from a broker like Exoclick or whomever. With ad spots you can find a site or blog in your niche and it should produce some sales for you. But just willy nilly buying "traffic" to send to any paysite is not a great strategy. At least not for me.
In other words, if I could find a high sales-producing ad spot or link that I could scale I would be sinking all my money into it. LOL But maybe your sites will do better with niche ad spots. I would start there.
