For campaign missions.
Is this bad idea?

1 Hard Key = 4000 sm to 5000 sm
6 Hard Key = 20000 sm to 25000 sm
1 Insane key = 7000 sm to 8500 sm
6 Insane key = 35000 sm to 42500 sm


Want to get dat 2 achievements and 2 mythical plus 3 10000 power kit

I think its fine how it is, I just looked around my room, found a few dollars and put them in my bank, Then bought a 400 token package, And that's plenty to get all of the keys (:

Im not too sure, though. but saving your tokens from the first you bought premium acc for 1 day without spending those tokens could even enough for the whole hard and insane missions' keys.
Best regards~
[insert name here]