Geny, the reason is very simple, they don't need to do it.
If the game would be in trouble or finances weren't good, what would you do? I think in many options, and some of them doesn't require big investment in things like advertising: what about better customer service, promotions to show people that buying premium might be worth, special prices for some days (such as cyber monday or christmas eve), did you see any of them?
There are many things to translate, many of them are fully translated in developer's hands, do you see something new translated? Translators did their part, developers didn't.
Why nothing change? Because it's not necessary, as long as people keep pulling extra youth using token, avoid to spend time to get youth reports, or keep healing their injured players with their money, there's no need to change something.... Even more, the lastest "new feature" is that "everything you buy is redeemed inmediately", they don't need to verify transactions anymore, how can somebody call that "a new feature"?
So yes, i laugh when somebody tries to buy some ingame advantage and fails, this game is stuck and developers are not the only one to blame, as customers, we also have rights, giving money to somebody who ignores you is not a good way to make them worth, i might be argentinian, my country might be poor, but i am not stupid.
That said, i say that the last time that GKO added a new feature, player faces changed, the avatar engine never were finished (coaches are old engine looks and shirts aren't displayed properly in our player's faces), when that thing were added i bought 1 year premium (it was september 2013) nothing changed happened since then so i stopped spending money in the game. That doesn't mean i am cheap or that i don't want to spend money here, it means that i want to support a growing game, if GKO provides something "new"and worth to see (or avatar engine is finished) i will buy premium again, else, i will keep clicking one or two ads per day, that is far enough payment for a game running in auto pilot.
I would love to see more people thinking like me
Edit: Spam, nice speech, but admin doesn't owe you "10 tokens or a better report", he owes you respect, too bad you haven't realized of if and you still want your advantage (a better fast report) or your tool to take advantage (token), and how get those 10 token are irrelevant, you said it "you owe me 10 tokens or a better report", so....?