Competition is a necessary thing.
But not all competition is equally productive. The video poker challenge clearly has real-world relevance, whereas the eating challenges are probably more dubious. In the USA, we have non-productive competition in the form of crony capitalism. Success in business is often achieved by obtaining favors from government, and using government as a weapon against rivals.
Faster machines is a really good thing, especially if you're worried about attracting attention. I try to keep my hands quiet, and I've only rarely had people comment that I was playing fast. It's impossible to play two machines without being noticed.