Spending real money can give you an edge VS non-spender couse you can have more rosource to rank up pg and/or have some aweakening gems and the like. Spending real money can speed up your in-game achivements couse you can buy more pots and/or revives too.
You can have the same in more time. BUT the more time you take to achive some results the less they can help you couse the game evolves. So it is better if you run all events for maximum rewards (units and resources) and do some arenas to gain more units to 100% story quests.
I know that,i was grinding arena hardly last winter(7 months ago)
I could do any quest,and had many units,but since i have stopped playing arena,i cant finish always uncollcted without some items to spend,i dont have units,cant buy revives so i can finish quests and i am always stucked somewhere..so that means u need units anyway...buying offers or grinding units..
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You can have the same in more time. BUT the more time you take to achive some results the less they can help you couse the game evolves. So it is better if you run all events for maximum rewards (units and resources) and do some arenas to gain more units to 100% story quests.
I could do any quest,and had many units,but since i have stopped playing arena,i cant finish always uncollcted without some items to spend,i dont have units,cant buy revives so i can finish quests and i am always stucked somewhere..so that means u need units anyway...buying offers or grinding units..