Progressives don't work that way.

Each machine has a set % payback and a paytable. These are strictly regulated and documented with a PAR sheet. So regardless if the machine is connected to a progressive it behaves the exact same way.
PAR = Paytable and Reel.

It is possible that the casino will set the % to 85.5% which is the lowest that the Nevada laws permit, and as most US states us the Nevada game book - so that they don't have to invest time (money) certifing each machine and PAR this is usually the lowest %. Native casinos are not regulated so they can be much lower. I have seen some casinos state that they pay an average of 92% which means some are 85.5 and others are 98.5.

How the progressive do works is that it gets a % of each bet added to the total amount and when the top award is won, you receive the progressive amount that has accumulated. The house take (or hold as it is called) remains exactly the same on the machine.

The % contributed to the progressive is normally considered marketing and is written off as an expense on the casino books. Generally speaking that % is
1/8th of 1%. So for every 8 quarters played the progressive goes up about 1cent. Once the progressive is won it goes back to the reset amount which is usually the same as the top award would normally be.

So not only does the casino get to write this off it does not affect their normal profit margins.

Sometimes the manufacturer will pre-seed an amount on a progressive and will underwrite that for the casino. Ie The Starwars theme came from IGT with 1million pre-seeded on it. If it was won on day 3 obviously the casino would lose out as the machines would not have accumulated 1mm in that short of a time but as IGT wanted those machines on the casinos floors they pre-load 1mm on it, and the casino knows numbers like that draw people so they are then anxious to buy or lease the machine and IGT writes up another sale.