$50,000 to spare that the Nepalese government want
Is this a search and rescue fee to get your corpse back down when you fail to climb it or is that extra? It's likely you would do permanent harm to yourself even if you did make it.
15,000 meters... no 8800 meters... Mars has a couple mountains that big. Nothing here.
I've done Mt. Hood a couple times. That's 3424 meters and it's a challenge, but not suicide. Even at 3500 meters, elevation sickness will kick in if you stay very long. It's pretty hostile. People take kids up there like it's a picnic. Some of them don't come back.
If I trained for a year, I'd probably end up backing off Everest. Most people don't make it and it has about a 5% mortality rate for even trying.
From my reading, it would seem you'd end up wandering through old oxygen bottles, tents and corpses before you summit Everest. It's not a wonder Nepal really doesn't want people up there.