That, and also they may reveal interesting things about other people, the world, or even yourself, that one never thought about. So, now I would agree that they do have value. 
However, it is impossible to learn things about other people in a dream (maybe unless you believe in shared dreams and such things 
). Dreams are best for learning something about yourself. Unfortunately, lucid dreaming requires quite some effort (which for me mainly means keeping a DJ), which means less time to practise things in WL. 
Sometimes the latter is more fun… so I have gotten out of LDing a bit. 