According to a comment in a forum, if you would like to improve visitors to your site then you have to target less competitive keywords so that you can get ranking in less efforts. When you have number of keywords then there would be more chances to get more traffic.
http://forums.digitalpoint.com/showthread.php?t=1546700
Diversifying your SEO is vital considering the possibility that your main site could be banned in major search engines like Google. An SEO Monopoly can help you form multiple sites in your niche that attract your potential customers.
