The quick answer is google only thinks a link with a certain level of PR (pr 4 is the old rule of thumb) is a relevant link -that means this link will show up when you do link:www. yoursite.com
you might have other links, which is good, but google doesn’t think they are as important
You should also have a couple of variation for link text to your site – it is good to have poker, online poker, online poker sites etc.