It seems 200 people did it so far, around 4% of all climbers (at some point of time) :https://www.mensjournal.com/adventure/climbing-everest-adria... probably more of the 5k could have done it if they wanted to do it (and prepare longer for it).
Edit:maybe I was thinking to complicated in this reply. The analogy is: you have two different things which can be achieved through doing a specific thing, but doing this thing is hard in both cases so using the word 'just' is not appropriate which is easier to see in the example.