Hard to say what is "typical" for a cb ratio for hops to sales, but in general it is about 100-200 hops per sales from my experience... if you are not converting go back and look at your landing page and see how it flows... are you getting their attention with the title, are you giving clear-concise reasons why they need the product, is there a clear and direct call to action? If your landing page article is too long you lose their attention, too short and and you don't convince them to click...