@mcc I did an internship in a recording studio where I learned one day they had five (5) identical vacuum cleaners.
I asked what's up with this and the owner said "I did the research, these are the best vacuum cleaners, so I bought five which should last me a lifetime without ever having look into it again or worry they stop making these."
I thought it was a bit wacky at the time, but I understand it more now.