Ultimately, a bit of both, out of necessity.
Initially, I got into it for the sport, as a teenager, for spearfishing; then, later, being stuck in some of the stickier parts of the world, for a few years, which required that I maintain my own stuff, since I really didn't trust the boozy run of shop weasels around me.
While I do enjoy the gear itself, it's just a means to an end; and I seldom replace things outright; am not what I would really consider a gear head; still regularly use bullet-proof regulators from the 1970s; and am of the mind that many divers nowadays. carry far too much crap, along with them, mostly for show.
Can't tell you how many times that I've helped out so-called "tech" divers, bristling with gear, "turtled' in the surf -- pony bottles and redundant computers up the wazoo; but, yet, incapable of getting on their feet, after being tossed in the waves . . .