yeah as far as the aesthetic stuff goes - camo's, knives, etc; - not a big deal for me personally. if the premium knives gave you better stats at something like maybe less dog tag taking animation time or something then ya i'd be down but they don't do anything.
the battlepacks - i never get anything i want for guns i use. with boosters, i have like 7-8 100's, 50+ 50's and 70+ 25's saved up so i don't really need those.
double XP - i'm already 113 and have more than enough boosters to get to max level.
that's why i didn't go premium but not everyone is in my situation so i can understand buying it. those are just reason's why i didn't.