Please see the adsense thread in my sig. here at the DP forum for an answer to your question. I go into a lot of detail in my answer. TomG.
1 good quality website will bring you more that $10.00 a day. it will all depends on content, ads placement and visitors.. all put together with a good SEO then you can earn more money out of it.. it really doesn't matter on how many sites..
I need just one site to earn more than $10 a day. What I all want is terrific, targeted search engine traffic. The target is easily achievable