I just checked Rocketpot for the first time, and here's my impression of it.
1. I think it's very important to have the option of cashing out earlier than the target, and it's good that this site has it. It's true that players rarely have the nerve to wait for a payout above 200x, and yet I think they should the ability of cashing out any time they want to.
Why do you need to have this options? And if they implemented it on the site what is the benefits? I do not think that it is really important to have this feature, the only aim we as players want to get is the jackpot. Not some little multiplier like this. More over if you have this feature implemented then it will be not as good as before. The adrenaline to win something here is missing
I agree with Betwrong. That's a good feature which makes the game more exciting. I like the possbility of cashing out the profit at any moment. I always prefer the websites that have this feature. But you are right that people mostly are playing for the jackpot and bet on specific little multipliers.