No one knows this better than climbers. Our goals are entirely arbitrary, and their shape determined entirely by their difficulty. The highest peaks and steepest rock walls are valuable only inasmuch as they give us a foil against which to strive and exercise our will.
I think John F. Kennedy put it well when he described the reasoning behind his goal to send humans to the moon. “They may well ask why climb the highest mountain?” He said. “Why, 35 years ago, fly the Atlantic? Why does Rice play Texas? … We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills…”