This, exactly.
Because someone has a trait to be the best at something is all the MORE reason to challenge them, really. Push them and ourselves to everyone's limits, and if they end the game still top dog, then the losers have the satisfaction of knowing they lost giving it their all instead of the partial-satisfaction of beating people not better than they are.
That's why I love to join in on art contests. I'm far from the greatest out there, and I rarely even place, but when I do it's an amazing feeling because I KNOW I earned it, it's not a half-hearted attempt among others of my own league, but something where people far beyond my level can join in and I strive to compete with THEM rather than settle for something less where I stand a better chance.
I guess, in short, without challenge, we don't grow--or, as better stated by one of my favourite fandoms "Only pressure makes diamonds, ease begets decay"
/rambling post is rambly