It seems that to increase the price of your blog in Blogshares, you need to comment on blogs. On a lot of blogs. Blogs that are also in Blogshares. Or have people link to your blog. Blogshares only seems to care what's on the main index page of the blog, and with comments being transitory things, you need to do a lot of commenting. Which usually means a lot of blog reading. Now, I don't know about other people, but I work during the day, and have other things to do in the evening so my blog reading is usually a spare time thing. And I generally don't have much to say about to other bloggers in their comments.
And aside from search engines, I think I might have 2 or 3 regular readers (myself included), so I don't think too many people are linking to my blog. Not that I care that much.
So I guess my blog will be relegated to Blogshares mediocrity, and my blog valuation will remain at $1000, aside from occasional spikes when I find something interesting enough to comment on.
I guess it's a good thing there's no real money involved.