One of the 5 keyboards on your list you used all the way through university, and there's only 2 keyboards after. This feels far from an unhealthy obsession to me.
Although if you can hold forth on how to find old keyboards on eBay, that may also qualify.
Just one of my hand-build, custom switch, aluminium-case, custom-firmware,"artisan" keycap, mechanical keyboards would buy all of those on OPs list, probably twice over.
It's good that OP is keeping a lid on their keyboard buying habits (as with anything), but realistically, OP isn't even in the same _universe_ as the people with the _real_ unhealthy keyboard habits.
There are/were people on the mechanical keyboard sub-reddit whose keyboard collections reach into the tens of thousands of dollars.
But gotta generate that clickbait headline ;)