Is this really common-to realize the importance when its nearly come to an end?

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Almost everywhere I look, people tend to realize the importance of one thing when that thing is nearly come to an end. It is quite applicable to all, living or non-living things. In non-living things, say, you have a slipper that you dont want to use. The moment that slipper was being use by others, you will just realize that, the slipper is somehow important to you. That this slipper is one of the things that you dont want to loose. In our life, as living creature, we normally realize the importance of the person if he or she needs to leave. That we will going to missed the usual things, the laughter and the joy that you bring to each other. But, is this really normal, that we tend to realize their importance, if the person will be leaving or the thing is nearly come to its end?