@MozartLink,
While I enjoy the easy life, I do not believe I would enjoy one without problems. Everyone has their hardships and it's how they overcome those hardships that leads to the development of character. Many times we choose NOT to overcome those hardships because it is easier to just live with them instead of fixing them.
For example, some obese people know that they are obese, they know that diet and exercise will fix their obesity yet they choose not to. It's harder to overcome that hardship than to just live with it. Even though later in life it may actually end up make their lives shorter.
Some people take drugs including smoking and drinking. Some people resort to domestic violence, some people are just down right awful people and they decided to be that way instead of trying to correct that.
Hmmm, I strayed... I firmly believe that even if science and research came up with a cure for EVERY single thing that causes suffering and illness that people would simply find new ways to suffer. They are masochists that way. No matter how good ones life is, they believe that they should be suffering somehow.
Another example. I have a good friend that has to have a person at work as a mortal enemy. Usually another female in the office. Every single job this person has had, there has been someone that just pushes her buttons and drives her crazy. She complains endlessly about that person and I think she needs that as a coping mechanism.
So, I kind of agree with your last point, people like misery. It's something we all know about and can relate to. No one has a life of pure joy beyond the age of 6.