i just noticed this now- when you get to max line activation of fleets cost is more than half the price of the fleet cost after disount
heres an example:
Fleet Bad Dominator MK 9.5B now has 1 ships. You spent 1.518.000.006 credits
It will cost you 948.750.004 credits to set the fleets: Bad Dominator MK 9.5B On online active mode.
i would like to suggest that when activating fleets their real value(what it acctually costs to buy them) would be taken into consideration and not their value without discounts

EDIT: or at least introduce a commander skill that would lower the cost of activating fleets