IX15 will be listed on one exchange to begin with. This is because investors can liquidate their holdings off exchange via the smart contract any time and receive ETH in return. So the success of the project is not dependent on the exchange like with most ICO's.
Its is totally different and I agree that I havent seen any thing close to it. Are you promising profit on investment or just a get your money back whenever you want to by using the smart contract?
BTW exmarket is a great start. I bought some tokens in IEO there and sold for some profits too. Lucky me.