As someone who is into more 'extreme' endeavours, it's more about the experience than the result. Where's the fun in having someone else do the heavy lifting?
Second, why not climb new mountains? There's plenty of interesting places in the world to explore, climb, and have an adventure. Plenty of peaks to ascend (and descend on skis!), plenty of remote locations to reach, and many peaks where you can bag a first ascent, rather than be the X climber to have been carried up by a Sherpa...
Want to be extreme, and enrich your life experience? Learn how to actually be a mountaineer, learn the ropes (figuratively and literally), and do something on your own. But I guess that's too hard.
About the Sherpas on Everest - they need to decide as a society whether depending on tourist dollars is what they want, or whether they want to actually create something...