I've been dealing with bi-polar disorder (manic depression) for many years. And I'm not the only one.
People who suffer from this disorder hate feeling depressed for obvious reasons. But some people enjoy and like feeling manic. It makes them feel alive with endless amounts of energy.
Of course, I don't like feeling depressed. However, unlike some individuals with this disorder, I don't like feeling manic either. The reason is that when I'm manic, I know that I'm sick, and that it could get worse from there.
Hence, I like being reasonably happy, happy in a healthy way instead.