Question: I don't like the income 50x modifier can I change that ?
Answer: Yes you can but not for you current company, you'll have to create a 'company scenario' and create a new company.
Notice the 50x modifier was carrefully designed to give you a fair game
and a nice career, of course you have x50 fee but also x50 income.
Setting it to lower number would imply that it may take you forever to buy
bigger aircraft.
The income modifier setting as well as several advanced setting is not available by the normal create company dialog this is why you have to
create a scenario for that.
Open the FsPassengers folder and look into 'config/MissionGamesCfg/ a 'readme.txt' is into this folder to help you make a new scenario.
Once done, create a new company using your scenario. Notice you can transfert
your pilot to this new company, they will play under the new rules.