Because by default vbPlaza only uses 10% of the game cost to increase the jackpot by to avoid the jackpots growing too much.
U can customize this setting from -> Admin CP -> vbPlaza -> Manage Settings -> ibProArcade Jackpot Increases X Percentage of Cost to Play
When u first edit that setting, u will see it's set to 10, if u want it to increase by the entire cost to play, enter 100.
-CMX
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