I'm a programmer in the futures business and, on the side, have designed a way to use Bitcoin to bet on commodities prices and the outcome of sporting events:
https://www.bittrade.toIt's probably not exactly what you're looking for. It's not decentralized. To be honest, it's total "amateur hour" level compared to BitMex, but I'm slowly building up a small group of traders. If it sounds like something you might be interested in (you mentioned you know something about marketing), hit me up.
KJ