Many years ago one Saturday morning I happened upon a juggling shop. I could already do three balls so I asked if I could try the clubs. After about an hour of failing the shop owner said something like "some people never get it". So of course I bought a set. After 12 hours that day and 12 hours the next I got the hang of it. They are harder to learn than balls but still doable for an unsporty person like me. And, as you say, very satisfying.
I am not the person you're asking, but they were a thing in The Netherlands at least. Not super common, but they did exist. Typically they sold other related things too, like diabolos, flower sticks, etc. This was a while ago, before Amazon, when there were just a lot more different types of shops. I am not sure they still still exist.
