muggle your post makes to much sense. In fact some people with lots of equity are like that. They see the opportunity to take big profits without being biased by the fact that two years ago their neighbor made more profit. They understand that they can take the profit, move on with their life, and make an even better return in the next few years rather then lose more equity.
Some of them understand that. Others do not. They believe that next year the market will magically turn. Or they believe that they will get a better return by holding on to the home. Or they are emotional about it and cannot fathom that markets go down as well as going up.