The whole mechanism of special offers and "free" stuff is an insult to customer's intelligence... first the 3 "regular" offers that just sit there to justify the discounted offers. Nobody ever buys anything at the regular price so there is actually no discount, just a fake base price.
Then there are the shameless attempts to sucker players into buying an overpriced "revenge pack" right after they have lost a bunch of units. Using customer's emotional state to trigger an irrational decision to purchase "stuff" far above market price.
Finally the idea that the more you spend the more expensive it gets. For $10 you get 14,000 drachmas and X free extras. for $20 you get 18,000 drachmas and 1.2 X free extras? Does Plarium think we are total morons? When they move you up to the $20 pack level all the $10 offers disappear so you are supposed to forget how much the stuff used to cost and accept a 170% price increase? If I'm going to spring for a $20 pack I want 30K drachmas and 2.2X extra stuff. That's how volume discounts work!
I can wait for the $10 packs to return (which they do once the Plarium algorithm realizes you stopped buying anything) and while I wait I save a bunch of money. Good for me - bad for Plarium's profits. Plarium: Maybe you should take some marketing classes?