Couple days ago I was at a trib. I talked to a guy there with his two buddies and they said they had been there two hours already drifting into the pool.
Just as I was leaving after about an hour, he hooked on to a chinook. He fought it for about 7 minutes and he was all smiles when he finally landed it. He then promptly released it without any pic.
All anglers have different personalities and being the picture happy guy I am, no way I'm letting a nice fish go without a pic after all that work and effort! I like to proudly display my "trophy" by email to my few fishing buddies. And a few years down the road I like to have that pic to look back on to go with my good memories.
For some guys, the experience is enough without the visual documentation. I work with a guy who doesn't even own a camera and doesn't take pics with his phone when he goes away on vacation to far flung places. He's got all the images he needs stored in his head.
I saw the same thing in the spring when a couple of guys were nailing steelie after steelie in the two hours I was there. It was like they were so used to catching them that the novelty has worn off and there was no need for pictures. But then again they were excited after each catch.
One of my fishing buddies doesn't take a pic unless the LMB or SMB are 3+ lbs. Or the pike is 30+ inches.
I've been fishing for about 7 years and I literally have a picture of every fish I have ever caught over 1.25 lbs. Except for the very first salmon. My camera lens happened to die that very moment I turned it on even though it was working perfectly fine on a road trip a week earlier.