Ask HN: Is there a way to Buy/Sell Posterous themes?

By that I mean a structured way so that the buyer will see a live demo, much like the native theme selection, and then place the order and receive the files/code for use. I ask this because I plan on building a few themes and releasing them for free, and hope that it will generate interest for the quality themes I have in the pipeline. 1) Is there a Posterous theme marketplace? 2) Will Posterous object to this? 3) How can I licence or protect the css/markup for my themes? And finally, what stops an savvy user from digging into the source of the Live Demo and simply copy-pasting? Would appreciate some input