Joni Mitchell stopped touring because of the hassle of touring with 20-30-40 guitars; she used a crapload of tunings & carried a guitar for each rather retune every song.
Reading/watching Premier Guitar magazine's Rig Rundown features, even for one-tuning folks, it seems to be the thing to carry a different guitar (but often of the same model) for every song - for example, Bonamassa using this '59 'burst for this song, this '59 'burst for that song, for a real change-up a '60 'burst for the other tune, etc. Having no interest in metal I disremember the player, but one guy uses 7 same-model ESPs or some such pointy nonsense, each equipped with same-model EMGs.
I can see carrying, say 1 Fender, 1 Gibson, a 12-string and so forth, but the same freakin' model? Hey, that one sounds really red - much better choice for this tune than the blue one!
Too much money. What ever happened to the good old days when rock'n'roll people stuck their extra cash up their noses or in their arms??
Peter