Pius.us, An SEO friendly web directory

I've noticed that a lot of new sites are getting high serp in Google lately. Take Pius.us a web directory launched a month ago, placed top 20 for keyword SEO friendly web directory in the first 2 weeks of launch and now in the low teens. Granted, A lot of webmasters are saying that newer sites mostly get high serp when they are new and slowly fades out. Google is getting slack, plus there is only 11-15 million return for that keyword anyway.