Not to mention exchange rates. If you bought 1 ETH worth and they converted them for $300. Later ETH goes down to $100, they can kind of call off the whole th

Not to mention exchange rates. If you bought 1 ETH worth and they converted them for $300. Later ETH goes down to $100, they can kind of call off the whole thing off by giving people's money - ETH back and claiming they are closing the coin. If it goes to $400, it will make ETH denominated profits difficult to be paid out.