As I see, there is a big bonus on free rolls that declines after each role. There is a percentage bar that says 70.69% achieved towards the next +0.00000008 BTC bonus!. There are two ways to increase this but my focus is on play jackpots with Multiply BTC. There are five cost options to win jackpot, that starts from 2 satoshi and goes up to 12,500 satoshi for each roll. In order to increase my free roll reward, does the quantity of multiply btc with jackpot matter or does cost for jackpot increases my percentage more for increased free rolls?

By the way, I have been rolling lots of coins with multiply BTC + jackpot but this bar increases so slowly that there is no hope for it to reach 100 ever. Each free roll also dramatically decreases this percentage.