Ironic, coming from somebody who has taken the time to travel across some non-trivial percentage of the world to (then) listen to the entirety of Opus Clavicembalisticum (more than once), whereas my response took a measly two minutes to write, surely less time than it took you to write some of your own in this very thread.
Incorrect on a number of counts, I fear. Firstly, no irony is involved. Secondly, I have travelled what you call a "non-trivial" distance to listen to a performance of Opus Clavicembalisticum only once (though what that fact has to do with the matter that you raise remains unclear, as I am about to demonstrate). Thirdly, my reference that you quote was to people who have little idea as to what to do with the time that they have on their hands, whereas anyone who decides to go anywhere to listen to a performance of anything must have a clear idea in advance of what he/she wishes to do with the amount of time, including travelling to and from it, that will be required to attend such a performance. Fourthly, on the question of the amount of time spent in posting, different posts will take different members different amounts of time to type and, in any case, not everyone here has the same typing speed, so the fact that some posts take longer to type than others is one that hardly merits comment in this or any other context.
All that said, none of the above (your post or my response thereto) has any more connection with Medieval brass rubbings than has Sorabji or his music, so my suggestion above as to where to progress from here still stands.
Dear me! - what a load of rubbings!...
Best,
Alistair