In this update, a jackpot like a system was requested in the discussion so I added it.
How it works: IF the system is set to true(Changeable in config.yml) and if a player loses a spin then its takes the configurable JackpotPercent and adds that to the stored jackpot balance in the plugin. it will carry over reloads and restarts. Now if a player wins on a spin it will take that jackpot balance and add it to the reward the player won and reset the jackpot balance back to 0