There are lots of reasons to own knives and only some of them are about practically cutting food. A lot of this hobby is experiencing different steels, grinds, and profiles so that you can better understand both your own preferences and the design philosophies of various knifemakers. To gain that kind of knowledge and experience, you have to use a bunch of knives first hand. And for most of us, that means buying (and then often eventually selling) "way more knives than we 'need'".
People outside the hobby think that you only need the knives that let you cut food properly. But those within the hobby have purposes beyond simply cutting things and those purposes require more knives. There's a point where people end up buying knives for no reason other than to have them, and they end up unused. That's the realm of the true collector.
I don't personally understand that subset of the hobbyist subculture... the people who spend thousands on unicorns that end up spending spend their lives in drawers or boxes rather than doing something genuinely useful. Or maybe I do understand this approach and it simply holds no appeal to me. Having knives that you neither cut with nor sharpen is a waste and a shame. Having lots of knives that you use and enjoy is neither.
It is important, however, to check in with yourself every once in a while to make sure that you're buying things for good reasons and not just burning money on the hedonic treadmill.