Can anyone make sence out of this?

Ok so my site I sold a little bit ago jumped to a pr6 from 0. http://tutorialcraze.com . Now listen to this:

My friends site http://adfect.net is the same type of site (photoshop tutorials). We both run the same script, we both submit out tutorials to the same places, the only difference is his site is a whole lot more then mine. probably 20x more traffic. His is a pr4.

I never used any seo tactics or even updated the site it just sat there with a few tutorials. Any idea?