I’ll respond before reading the thread to my reasons are untainted, but I’m guessing a lot of repeat.
NBA basketball was the first sport I had any interest in. I grew up in Vancouver, WA, so the Blazers were the only pro team around and my first long term girlfriend in high school was a season ticket holding family so I got to go with some regularity, combine that with catching this interest just as the Drexler era was really hitting its stride and I had a six or seven year love affair with basketball (and not just Blazers, for a while I was happy to watch any games involving any teams).
But now I pay so little attention that when I happen to see a standings table I have to pause to realize that I actually did know that Memphis, Okalahoma City, and New Orleans have teams now.
Why did I lose interest? I think:
A) No matter how amazingly athletic the players are, and it is amazing, I eventually grew accustomed to it, blase even.
B) Most of most games don’t matter. It feels like if you watch the first five minutes you’ll know who’s going to win and when that’s not true, just watch the last two and you’ll see all the excitement.
C) Most games in the season don’t matter. With more than half the teams making the playoffs there’s very little “pennant race” type excitement. You’re generally way out of contention or easily in even if the exact place isn’t known.
D) The playoffs take forever (though this is increasingly true of MLB as well which I don’t like), it is just too hard to maintain playoff excitement for what feels like five months.
E) As the icons of the game when I first got interested began to retire their successors just never really captured my imagination. Don’t know why and that isn’t necessarily a reflection on them.
F) I moved to the SF area which, near as I can tell, hardly gives a flying leap about the Warriors and so there is no real community vibe around it.
Many of those apply to baseball to some degree but I still love that game, but somehow they combined in a way with the NBA that just turned the switch completely off. I suppose that if the Warriors went deep in the playoffs I would get into it for the run but it would be a pure bandwagon thing, I couldn’t currently name even one player.