Man enjoys competitions the most. Because here, the results are always rejuvenating. There is never a success that cannot be made sweeter, nor is there a failure, where there is nothing to feel happy about.
I think we began with competing with the nature. As time went, our victories effectively ended many such instances. As we go ahead with inventing new opportunities or fresh such instances from each victory, there is an issue. Not many people can contribute here as it takes certain intellectual build. Hence there always is a time lag. How to fill this lag.
This is where irrational ideas come to our rescue. The advantage of such ideas is that it enables one to feel opposition, without having the need for an opponent. And the disadvantage is that whoever wins, the one oneself is the loser. But one benefit here surpasses all the drawbacks. A loss, as well as a gain, can be made to appear the way we like.