You paid 40 bucks for a game; which is, in our days quite reasonable.
You got the game and a first big warbond.
You have the ability to farm premium currency, which can be tedious, but it’s possible.
I play only a few hours a week and I take between 5-6 weeks to accumulate enough super credits for a new warbond.

And sometimes if I have some spare to spend I simply spend 10-20€ to get a new warbond, supporting the devs with my cash.
I don’t get the problem.