Prestige increase cost

[zephyrx1]

Is your feature request related to a problem? Please describe.
Currently the only way to increase prestige cost on unlimited prestiges is to multiply it with a specified number in the config and then the prestige cost ends up being way too high.

Describe the solution you'd like
Add an option to increase prestige cost by a specified number every time, using addition instead of multiplying

(for example when its 200k per increase)
P1 = 1,000,000$
P2 = 1,200,000$
P3 = 1,400,000$
etc.

Describe alternatives you've considered
There aren't any alternatives

Additional context