Audio is a bit different for me than other hobbies like art, music, film, literature, but motorcycling is the easiest hobby to compare.
I love motorcycling and am down to five motorcycles, all very different (and very old but reliable). For motorcycling I don't think any particular bike 'presents roads' in whatever may be deemed the only correct manner.
BUT, in music I believe the goal is the single most accurate presentation of whatever source is being played. I don't think there are a bunch of 'correct' ways to present the source or the music the artist intended.
So, for me, having a second music system of lesser or different quality would make me second guess the 'A' system. I don't need a 'classical' system and a 'rock' system. All music should be played accurately. (I would like louder speakers :-).
That said, I'd love spare speakers to fool with like DQ-10s, Pulsars, Magnepans, etc! Many give me pure joy because of the accomplishment for the cost (my Elac Debut F5.2 floorstanders and bookshelves in the TV room come to mind.)