Serious? Well I guess on your list of similar meanings, mine would be meaningful, and on a scale of 1-10, would probably be about 5. Centered mostly along the lines of enjoying a large variety of music and having a dedicated area of the house set up for my audio and a large collection music and an adequate system to play it.
Since I"m no longer into large, loud, big venue concerts and have no desire to re-create the scope of one in my audio room, it takes a fairly modest system to play the music I like, at the moderate scope and volume that I enjoying listening. While I do from, time to time, consider upgrading veracious components of my system, it comes no where near an obsession and usually gives way to other needs and interests.
Jim