I am an example of it. 80% of what I own is sealed and I do not pretend to open it ever.
It is simple to understand, it's a mix of OCD's and keeping everything in perfect condition and ordered. It starts as a hobby, then it feels like when you do 4 rows at once in Tetris everytime you buy a new game and place it carefully among the others.
I understand when people buy a game, open it and play it, that's perfectly normal, but my brain works totally different while I am able to play as well, I don't feel comfortable opening them.
Every game I play, when I have little time, is a copy of a game I own. With Switch is a little bit different, because each cartridge has a unique identifier and playing a backup would be considered illegal, as that backup is not from my own cartridge, so if I really want to play a Switch game I can buy it cheap second hand too.
But do not misunderstand me, it happened all my life with everything. Every year before starting school, I used to have a little budget to buy stuff for school, and when I liked something I kept it sealed without using it because I didn't want it to deteriorate in any way.
I am a person who is paranoid about the condition of things and regarding game I feel very very sad seeing how usually people treat them in western markets. And it is no joke, if I buy something I am not happy with the condition afterwards my head starts to get full of ghosts and I hardly can sleep for days.