@datafish, what kind of product or service would that be? Is it truly unique? I think I've seen everything you can possibly call a product or service, and nothing is unique in the sense that all of them are merely variations of something else.
I don't have anything specific in mind; I was just thinking out loud. What if you used BTC to buy early shares in Mastercoin or Ethereum? There is no clear valuation in a virtual startup on the first day of issuance, is there? Would you pay capital gains sometime later, once the startup becomes successful and you use the proceeds to buy some conventional product or service?