I do, and admittedly it's why I raise my eyebrows a bit at their pricing and the way in which they've seemingly reinvented themselves into the Apple of audiophile gear.
Re: depreciation, I think maybe the sole exception to this might be limited edition cables, or, alternatively, really limited edition sets, stuff put out by relative unknowns in hyper-limited quantities. My Khopesh were part of a set of 200 (100 acrylic, 100 metal) but it's true that aside from visual novelty, there likely will be IEMs that sound better or have more interesting gimmicks in 10 years time. Then again, the Noble K10s still sound good, so while collector's value might not be there in terms of fiscal appreciation, if you find the sound that's right for you, there's extra value if it's a limited edition set that you can't get easily anymore. The collector's value is there for the end-user.
Case in point: after getting on a Last of Us kick watching the HBO series, I got really into the wardrobe (as I do with most film and tv classics I like--ask me sometime about the outfit I own that includes the exact sweater, boots, chinos and a very close replica coat Ryan Gosling wore in Blade Runner 2049). The watch Joel wears is based on a long out of production Lum-tec combat watch. I got turned onto the watch brand and ended up falling in love with their combat bronze series, which uses the same physical bezel but in bronze instead of titanium. I got lucky in that I happened to find someone entirely random selling one on marketplace (they only made 250 or so of them). Is it going to appreciate in value? Not at all, it retailed for over $1200, and I paid about half that. Is it an ultra collectible watch? Not at all, there's several other more expensive, rarer watches out there, and by watch collector values, 600 is barely bending over money. But it's collectible and special to me, and at the end of the day, that's sort of really all that matters.
