The monthly volume of searches entered on keywords can be found with a few different methods. If you have a Google AdWords account, you can use Keyword Planner for this step. If you don’t, there are a few free sites out there that will give you similar numbers. Obviously, if a keyword has higher monthly searches you’ll want to keep it in mind. However, that also might mean that it has a higher keyword difficulty, and fiercer competition.
I'm having a problem that I suspect many marketers share. Quite simply … SEO or just buy the traffic. I noticed that you switched to SEO because you like the passive income component. But when I consider ALL the work and ongoing moving parts to SEO .. visions of the hamster on a treadmill appear in place of couch potato cash. Have you noticed that there is always something new to do … now it's Google+ ect. and "more to do" is surly on it's way. It's reached the point where it's mind numbing.
Although it may have changed slightly since BrightEdge published its report last year, the data still seem to hold true. Organic is simply better for delivering relevant traffic. The only channel that performs better in some capacities is paid search ads, but that is only for conversions, not overall traffic delivery (Paid Search only accounted for 10 percent of overall total traffic).