Cool idea - I've always loved reading through the Hugo Awards each year to find new books, but I can never really trust that they're doing a great job. And sometimes Amazon does an even better job, recommending books like The Martian before anyone I knew had even heard of it.
What do you imagine 'Premium Content' being? And how do you think you can differentiate from what platforms like Amazon Kindle are doing?
You say your background is a game developer - care to expand a little? It seems like something like this would need lots of web development and payments integrations; when you say something like Steam, would this be primarily a website or a desktop app?
And would it let me get things in formats I can easily put on my Kindle/e-reader/iPad? Are those formats difficult to generate or pretty straightforward?