I play W O T on and off atm they changed a lot of things from back when i played in closed alpha. Gold can be gain threw in game events or doing some quest, can unlock rental tanks so you can try higher tier tanks down some lines if you wondering how they are. Gold ammo can now be bought with reg in game cash you earn but down side is its expensive for some tanks. They tend to offer alot of 1 day premium for doing dailys or any holiday events for vets or important WW2 battle days so its a fun game you dont need cash on.