I haven't quit... but I've quit "working" at it. My excuse is that I'm semi-old and lazy.
Thirty years ago I would duck hunt 30-40 days a season and if I killed 20 ducks, I was happy.
Now I hunt 10 days a season, give or take. I go where it is easy and probabilities of success are high, at least compared to the degree of effort.
Some of the change is due to habitat changes and duck behavior. Chickamauga and Nickajack used to winter huge numbers of ducks. But when the milfoil crash came in 1990, wintering ducks went with it.
Another important factor many folks don't consider.... it used to be that nobody fished in the winter. Ducks could sit down on the lake and actually rest and relax unmolested.
Now that people fish 12 months a year and there are boats buzzing all over the lake 12 months a year, ducks have changed their patterns, imprinting on other areas and bypassing places that used to be historic wintering areas.
Age and fewer ducks in Southeast Tennessee are the primary factors in my degree of duck hunting effort.