I cant remember how many times I went to some big music shop (where ever in europe) to try expensive tube amps.Most of the times the super expensive boutique amp was built up in the middle of the shop (for everyone to see) and I had to play it while feeling guilty playing loud "destroying" the ears of the employees or little children who just passed buy after their piano/akkordeon-lessons..
Then there were some vintage amps in some studios.Mostly marshalls,Fenders,Vox or Hiwatts.Fair enough.Ofcourse I was only able to play them for a short time when they had a "day off".
Now other way to try them.Only a very few guys I know own a matchless or a bogner etc..
Yes.The KPA is not only a tool.It is also education,inspiration which is equal to music.Trying all those amplifiers,cabs and stomps for as long as you like,in your own environment,ready to record it or to try it at the next rehearsal,asking the "next guy" in the www. to send you the profile of his rare vinatege amp from the most remote corner of this planet..this is a completely new thing.