First thing that strikes me is you have almost the same amount of threads as posts that indicates almost all of the content is from an RSS feed or something and not unique.
The blog theme is stunning, I like that but you could integrate your vbulletin forum a bit more by making a matching theme. Right now they don't feel like the same website by browsing through.
The blog footer has nothing in it and has a big empty space, if your not planning on adding any widgets there I would remove the space.
If you did the above and actually got some real content then it would be worth a lot more.
Right now, I would value it at around $40-50.