1st Pack = 1 Robots 0.07 Eth (1% chance to win epic robot)
2nd Pack = 3 Robots 0.21 Eth (5% chance to win epic robot)
3rd Pack = 5 Robots 0.35 Eth (8% chance to win epic robot)
4th Pack = 10 Robots 0.63 Eth (15% chance to win epic robot)