Roadtrip,Dancer told you what the base payback was, Arc told you what it was, that's all you need to know to figure when a progressive becomes profitable. I'll give you the JOB paytable although I'm sure it will be of no use to you. JOB base paytable is 1,2,3,4,5,7,25,50.800. The base payback for JOB is 96.147% with perfect play. If you never hit a RF the payback is 94.157%.You are confused about the 4%.This 4% isn't subtracted from anything except the casino's profits. The JOB progressive becomes profitable when the progressive increases from its base 1.99% of the game's total expected return to 7.83% of the game's total expected return, which would happen at about the $2600 mark for a .25 game.