Having an interest in marine life will add to that. There were several divers on Scubaboard a few years ago who took GUE Fundamentals together. For a year or two they posted reports and videos of their dives. The only things they talked about were their trim and frog kicks. Once they had "perfected" diving" they soon dropped out and found other interests. There was nothing to keep them interested in diving other than showing each other what perfect divers they were.
This is actually a topic of conversation at the dive site and a couple of instructors enlightened me why they think that cave divers are often active for a few years and then they quit. To them the reason for that is that technical diving often attracts type A personalities, people that simply want to be the "peak" at whatever they do. So many people go into diving for that reason, and when they reach whatever peak they desire, they get bored and quit.
And why are so many of those people with DIR agencies like GUE? GUE often advertised as the "peak" agency for technical diving, with the highest standards for certification and their divers are doing the big expeditions.