How can doing a complete RTW trip in a 'week or so' possibly meet the definition of the word 'fun' (in anybody's lexicon)?

I fully understand the concept of mileage runs though I never, ever do them personally. Sure, we go places that we'd like to go (and have been to before) and getting the miles is an incentive to do the trips but we always get off the plane and spend time at the destination. If you don't, what's the point? I've never understood the mindset of anyone who says "I'm flying to X" (usually LHR/LGW/FRA/NRT or somewhere similar) "will I be able to go straight to the gate for my return flight or will I have to clear customs?" What on earth is the point of flying for hours, just to turn around and fly back again? Sure, you want the miles to re-qualify but at least get off the plane and see where you just spent X hours flying to. Flying is intended to get you somewhere; flying just for the sake of flying is pointless (particularly in this day of reduced service, less room, crowded planes etc. etc). Why anybody would even contemplate trying to get a RTW trip done in a week is beyond me. All I can say is I hope they're planning to do it in D or A, and not in L.

OK, rant off .....