I am a meat fisherman, but I am with Rodney and Tex on this one.
Not so much for reasons of piscine altruism, but for practical reasons.
A 72-pound chinook must be a byatch to clean, cut and dress. Besides, judging from my experience with the big springs I have killed in the past (45# being the largest), a 72-pound chinook can't possibly taste better than a smaller fish due to the sheer amount of fat it has stored. In addition, the bigger the fish, the higher its toxicity ratio.
Why would you want to feed your family a platter of toxins?
So, next time you catch that personal record breaking tyee, think it over. Let it go, and focus on those 12-25 pounders for the table.
Your body and the salmon run will thank you.