@Seriost,
You might be right, I haven't quite figured this out yet.
The concept is hard to grasp because we can't see it, but I believe my explanation of happiness is as natural to humans as having two arms and a head.
You mention a person being happy from risk instead of security. And I believe this is an example of different primal survival attributes competing. And it's not said that the human brain always works as it should, maybe one of them is out of control.
The point is that both security makes us happy for the obvious reasons, and liking the thrill of risk had clear advantages for survival in the days we needed to hunt. The man shunning the risk of hunting would more likely starve. You notice that women, who usually didn't hunt, are less likely to like risk. I think I once heard that 96% of driving accidents are caused by men.
So this seems to not be a example of attributes that go against survival traits, just different survival traits up against each others. And then we might just not function correctly.
The leisure thing, I haven't figured out yet. But I'm confident that it works the same way. Maybe making sure to not get bored is something that keeps us from realizing that once all duties are done, there isn't really any reason we did it. We would just figure out that life is meaningless.