you call 3.75 perks too many,
^
As an isolated number, it seems little.
But it really is about perks/time. Resupplying towns/factories ranks very high here. When a M3 resupp run takes you 6 minutes, it's suddenly 37.5 perks per hour. This is almost impossible to earn sustained in combat. The ordinary player would need many of hours in combat to get the same perks as he does for one hour of resupping.