That depends on what you sell on your site and how many visitors you can convert into buying customers. And lets assume that out of 100 visitors 3 visitors will buy your product. Not too bad for one listing in a search engine. And to get found is really the key point. It is not only important to get listed, the key point is that your visitors need to find you .
Chances are kind of low.
Very simple I will reveal this valuable information to you for only a few Dollars. If you have lots of time you may go ahead and search for the information and you may eventually find it. I tried to get listed several times without success. So to get listed was not an easy task. I was thinking about using their paid service, but as you know, there are no guarantees either.