Sherpas trek up and down various parts of the climb dozens of times for each group that hires them setting up the next camps, routes, etc. There are people paid

Sherpas trek up and down various parts of the climb dozens of times for each group that hires them setting up the next camps, routes, etc. There are people paid for cleanup who also do similar. The tourists/climbers could do it but aren't as acclimated to the environment. Paying someone else to do it is probably the best way to ensure reliable cleanup and safety of the tourists/climbers.