I have found my initial foray into online marketing to be less than successful. It is odd what words people choose to find things online. The most obvious keywords do not neccessarily result in the most clicks.
I recall a book I read entitled Selling the Invisible, I highly recommend for anyone who sells consulting services.
After all of my efforts crafting the advertisements and honing keywords I have recieved only one click. For all that work, it didn't even result in a conversion. Fortunately, as an engineer, I don't give up easily.