Im not to fond of the design, at all.
However, 300-400 uniques is prettty good.
But, you dont develope any content. Everything, is already generated for you. Or linked to another site.
Which can be done by anyone. Why buy your site? When they can make a completely new one, equal or even better then your site in a few hours. For a small small fraction of your purchase price.
I suggest you start up a message board & a newsletter.
Once you devolope a 1000 or so members between them, and 1000 unqiues per day, I think you can get $700+ dollars for the entire site.