The obvious question is probably, "Why isn't your New York publisher doing these?" Well, to be honest, these books aren't right for Tor. They're just too short, in my opinion, for a traditional bookstore release. (Though I originally did do one of them with Tor.com.) I wanted to release nice collector's edition print versions and cheap ebooks at the same time. It's not something that is profitable for a large publisher, and so is better suited to doing myself. (EDIT--Note, with Legion and The Emperor's Soul, I'm working with very talented small presses for the print editions and am self publishing the ebooks. I don't want to take credit for what Subpress and Tachyon are doing, as they've been fantastic to work with. I love the Tachyon cover.)
I'm not sure if this means I officially get to join the indie writers, or if I'm already too far entrenched in my place to ever be considered indie. However, considering the company, it seems like a great place to be. I'm a firm believer that both indie publishing and big-six publishing will have a place in the future of books, and that both serve very useful roles. Seems like this is one of the best times in the history of publishing to be a writer, with more opportunity for more people and more voices.