Thanks for everyone's replies on this HubPages Ad Program CPM issue. I was becoming disinterested in the HubPages Ad Program a couple of months ago when I was seeing $5.00 CPM to $6.00 CPM. Lately, I've been seeing CPMs higher than $10.00 and one day nearly reached $20.00 CPM (which really surprised me). Does anyone know if HubPages has signed up better advertisers recently that pay more? Or, perhaps I was lucky enough to have the right ads clicked? I don't know, but it does make me more motivated to write for HubPages.