I've had my Quicksilver Mid Monos since 2015 and while they are being replaced, I have no intention of selling them. Same thing for my cj Classic 2se, it served me well since 2014 and I just replaced it with a Zesto Leto. I can say will certainty it will be the heart of my system for a while, its that good.
I've had my Magnum Dynalab MD 102 for about 10 years, no intention of selling ....
DACs ? Disc spinners? They come and go a little more often, I almost view anything that spins a disc as a consumable. They die, get out dated.
DACs can be viable for a while but are forced into obsolescence by new codes etc... I spend up to the point of diminishing returns , relative to the rest of my system on those.