This is why it's not good to put too much value in material possessions.
By extension you could make the argument that it's not good to put value in anything, except perhaps your own life, because anything you put value in can be lost (though in the case of your life you may never be aware you lost it). Friends, relatives, significant others, sports teams, memory...everything you put value in has the potential to hurt you. It's a great argument if you think the point of life is to minimize your suffering. But life like that is boring and devoid of joy. I say cherish not only the people in your life but the stuff, too. The fact that it hurts to lose a prized possession is evidence the thing was worth possessing in the first place. Same principle applies when your team loses the big game, etc.
Stuff, by the way, isn't just randomly accumulated material possessions, it represents memories, people, values that contribute to your persona. So it's not as if the value people place in stuff is just arbitrarily assigned.
Side note: feel like I should mention George Carlin somewhere in here. So I just did.