As we know, even FREE traffic has a cost. Unless you don't put a value on your time, though you should. And actually free traffic can cost more than paid because it can be SO much of our time. Most free traffic methods are a suckers game if you really think about it. I of course have been one of those for along time
But there are many people who have more time than money, so free methods "can" be the best route.
Using more paid traffic is one of those things I will be doing more of this year. Least that is the plan. Less time and can be more reliable.