The "Climbing Fee" should be $18,000 P/Climber. And it should be a fee, not a "deposit". However, the Climber should be able to redeem their fee, AT THE RATE OF $1,000 PER KILO of trash carried back down and deposited into a trash dumpster where the climb officially ends (W/calibrated scales etc.).
In addition, each Climber or that Climber's Guide Service, would have to foot exactly the same bill, on exactly the same terms, for each of the Sherpa's that go up the mountain.
This is a Rich Man's sport anyway, so a few more $GRAND might reduce the traffic jams and improve the environment at the same time!