Unbreakable

Has anyone ever noticed the extreme amount of correlation between things that are expensive and things that are fragile?
For instance, I spent almost a third as much money on the case for my guitar as I did for the guitar itself.
Why does it seem to be that, the better something is, the easier it is to destroy?

Now, this isn't the case with everything. My crappy, $15 shoes are falling apart, whereas nicer ones would probably not have holes in the soles that let the rain drench my toes from below.
But part of the utility of shoes is that they are durable. So, for anything that is not designed to be durable, the more valuable it is the more fragile it is.
Instruments, gold is a soft metal, plasma screen tvs (Have you seen the video where the guy breaks his tv by throwing a Wiimote at it? Classic.) and most other expensive, material pleasures are extremely non-durable.

I wonder why this is.

It's even true in nature. Endangered species, the rain forests, rare plants, even ferocious, beautiful creatures that are still vulnerable to human destruction (see also: TIGERZZZZZ YAY) are become scarce because they simply aren't durable. The only things we know would survive a nuclear holocaust are that stupid creeping vine from China and cockroaches, and nobody likes those.
Now, this leads to the question, are things that are high quality by nature fragile, or are things considered high quality because they are fragile?
Obviously, the harder something is to replace and the easier it is to damage, the better we will take care of it. But I still think that it is kind of a rule of the universe that all things that are valuable and good require you to take good care of them. God made it that way.

I'd like to think that, in heaven, nothing valuable will be fragile. This will be part of the reparation from the fall. Human bodies will not be so breakable, and they are obviously valuable, so why not the rest of the New Earth?
I think it's interesting to note that most of our made up "superheroes" from comic books and the like are considered powerful primarily (or at least in part) because they are insusceptible to gun fire or fist fighting or rocket launchers, etc.

It then becomes one of the saddest qualities of human nature that all of the things we value are destructible. We are in a futile struggle against corruption to maintain any form of beauty in the world, but it is all to fragile to survive without some serious help.