There is an underlying assumption that old big bucks have more value than a young buck. Biologically this isn't true. Scooter the young scrub has the same genes as he does in 5 years with a big rack. So why the hype about a 1 buck limit?
Monetization.
A big beautiful rack is rare enough to have a psychological value that can be monetized through license fees, food plot seed, management consulting, lease fees, advertising, hunting shows/channels...... the entire hunting industry has jumped on the "bigger buck" bandwagon and is marketing that message in pursuit of $$$
One buck rule is similar to a psychological marketing tactic that is often used on gambling addicts. "somewhere out there is the One big score" If you haven't achieved that ephemeral goal, then you must keep pushing....Pushing yourself, the regulations, spend more on leases, seed blends, food plots, gear......
As soon as a big buck is killed, it is compared to all the other big bucks in the whole world......Now its inferior again so the only answer is to keep going......gotta get a bigger one next time.....Maybe more regulations, maybe a better lease, Maybe if that guy down the road hadn't killed that spike 4 years ago he would have been a booner this year that I could have killed.....
Look at how TNdeer has changed. 20 years ago there were LBL hunts, camp outs, and tons of discussion about deer hunting and having fun in general. Only a few guys a season killed whopper bucks and most of the photos were of "normal" deer. Now the bulk of discussion is about leases, big bucks, antler scores, food plots, buck limits. Many hunters are opting not to post photos of their kills for fear of being ridiculed for it not being big enough, and often a photo is prefaced by some sort of excuse or deflection.