Take Trixon Speedfire drum sets, for example. They are REALLY cool in a very unusual....weird....way. I would love to have a set and display it somewhere in the room as a conversation piece. But, I have been told the sound of the drums is pretty terrible and that finding original parts for them is nearly impossible. I don't have a problem viewing something like that more as a piece of past "futurism" type art design, rather than something that necessarily has to be used in a utilitarian way. Some old drum designs just didn't sound good and they didn't sell well and so they disappeared...only to resurface as collectibles, now! So, in some cases, the focus of the design was far more of a visual selling point than it was a sonic one. That's why owning some of those drums just to look at would be A-OK with me! Of course, I would have to try them out just too hear for myself, but after that, I would put them right back on the display shelf!
In a more modern/vintage example: I have my Arbiter kit and I don't take it on gigs because of it's weight! The shells are TWELVE-ply maple and they are like moving a piano....more or less! So, yes, they sound great and they look great, but the practicality of using them on gigs is way out of line for me. So, I have them set up in my drum room and I use them to do all the goofy drum shop licks that I'd never actually try and pull on any of my gigs. x-mas3 It's kind of like my version of an X-Box! It's where I can pretend that I'm Horacio Hernandez! But, nope, they don't get used on gigs. I call it the "Grand Piano Principle"; That is, if I was a piano player instead of a drummer, I would probably have a grand piano somewhere in my house. But, would I take it on gigs? No. -same thing holds true for the Arbiter kit! heh heh