I'd be happy to answer any questions you have. I'm the owner/manager

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2 things I noticed in a few minutes on your site, by the way it looks good.
1. there is not sci-fi (at least I didn't see it)
2. the price looks wierd like 9.920000 something like that, in my opinion should look something like 9.92 round to decimal points.
How is the split with the author is it similar how Kindle does it? Thanks.
1. Sci-fi is in the main menu but won't show in the contextual menu until an author lists a sci-fi book. This saves you seeing a bunch of empty categories.
2. The trailing zeroes issue is due to having to switch back to USD as the base price. If you switch to BTC mode (converter in the footer section) you'll see friendlier BTC prices. I'm working on removing the trailing zeroes and a fix should be in by the end of the week.
3. Split is 90% author, 10% bitbooks.co