This game was fun at one point in its life. But each year and after every major update the economy of the game has literally inflated where it takes way too much time to get through a country's tech tree w/o premium, and even with premium it is still going to take way too long.
From XP to Silver Lions it is just plain and simple, YOU DON'T EARN ENOUGH to make a difference in the game, from overpriced repairs to overinflated research points you are simply better off just not going for those top tier vehicles. The community has cried for help several times while Gaijin has blatantly shrugged the players off as they either don't care about how the game is or they're just lusting for all of the money they can milk from the playerbase because that is the only way they can make a profit.
I really wish they didn't take this approach but they've decided to put their ideals first over their player's experience within the game, if I could I would refund every premium vehicle and penny I have spent on this game on vehicles I liked. Honestly it is just sad that they've slipped this far.
Stay away for your own sanity.