The reason your risk to reward ratio is so important in trading is because with a 1:1 ratio and a 50% strike rate (win rate), you would break even.
In fact, you would end up losing money due to spread costs, commissions, and any other operating fees.
With a 2:1 reward/risk ratio and a 50% strike rate, you would make plenty of profit. In fact, you could still be profitable with a 35% strike rate
(not counting trading fees).
This infograph gives you an overview on the relationship betweek risk reward win rate and profitability