As someone who owns over 60 guitars and had a friend with about 80, I find no problem with people having a lot of guitars. One thing that I do know, when I had just 10, I could even justify it to my wife at the time because even she could hear the difference between an acoustic and a bass. As time has gone by and I have had some spare money, I have bought guitars that I always wanted but couldn't afford when I was playing professionally. Since I do most of my own tech work, I keep all of them playable and rotate the favourite ones. Some are valuable, but that is because of the time I have owned them, rather than what I payed for them. I don't really have collector grade guitars, because mine are all players.
I have no problem with the number of guitars I have, and there will be more in the future. If others do, I personally don't give a shite, they don't have to have so many. Everyone is diifferent. My friend Tom who passed away had the right idea, life is too short (in his case this was really true), so if you want something and you find it available, and can afford it, then get it, you will feel better for it!!!