at least on everest, your frozen corpse can be used as a marker in case you get "lost"

If you go you die, if you didn't go you die as well. Might as well cut out the middleman and die right now.

You don't necessarily know that. Then again, some of the corpses on Everest might've just gotten real lost.

But do they on average, last longer?

That's the way to "beat" entropy, tread water for as long as possible.