My bosses buy collections all the time. There are weeks where they purchase 4 or 5 collections of varied items. Some of those are exceptionally cool, with a recent visit from a guy selling his stack of T206 dupes and lesser cards a prime example.
(Seriously, that was ridiculously amazing.)
Sometimes, however, they buy stuff I never want to see: 80s and 90s junk that I have to deal with. It's still cardboard and loads of fun, but considerably less fun as I have to find room for it. I walked in a couple of weeks back to find a collection one of my bosses had acquired over the weekend while I was gone.