Isn't this a Binary Option? Well, I think it is worth to try if any gambling platform where I play offers this kind of service. I think if one is so keen on the Bitcoin price movement, this gambling on the fluctuation of price of Bitcoin will surely give that person an advantage. This is like a skill-based gambling where the insight and prediction skill of a person is tested.
Yeah it's similar to binary option where you choose to bet low or high for short period of time.
I don't really sure if it's a skill based games because when the price just move like $100 or 0.1%, you could lose, the price movement is unpredictable, not to mention which sites that Rollbit use for their futures.
The price movement from one exchange to other could be different.