Quoted from Skeets:I noticed they changed the warp extra ball to 6 I think, where it used to be 3 warp ramps to light extra ball. Not sure why they doubled that, but most casual players will never see an extra ball if it is 6 warp ramps.
It probly adjusts according to percentage, it was probly determined that 6 was a good factory starting point.
In a real casual player scenario, it would lower to still be earned.