… or is it my math 
Boosters are told to double the base fee(in-game text). Well base fee is 12CR in 1 minute of gametime, so that times 2 and so on.
5,99€ for 12 hour booster that nets you a total of 8640CR extra. With 5,99€ you can get a 30,000CR merc.
For 3,49€ you can get a 17,500 bronze loadout card of your choice.
Am i missing something or are the boosters just REALLY bad deals? Would be cool to increase income with some way, but currently the boosters are so bad that it seems its better to just buy the stuff directly. (Might also be just one of those “better deal” funneling to purchase bigger marketing tricks".
And for boosters you have to input playtime to receive the benefits of it gradually. Its like you pay more and get to work for it also