I would guess most casual golfers just don't get into it enough to "get it". Some just play a couple times a year, hack away and are happy with that, I have friends that do just that. Maybe others can shell out $5 at the range and $25 or so for the occasional round but just can't swing the $80 or more for a good lesson, and listen to a mish-mash of advice instead.
When I was younger my friends and I would head to the range and hack away at hunderds of balls thinking maybe we'd get better. Of course we weren't practicing golf we were really just hitting balls. Maybe we thought hitting balls at the range was akin to exercising, the more you do it, the stronger/fitter you will be. Of course hitting a million range balls won't make you better if you have a flawed swing to begin with.
So I'm at the range late last year and I finally have the epiphany that maybe my swing was really flawed (@$#% up is more like it) and I needed serious help. At that point I was no longer the casual golfer who played a couple times a year, have fun and don't give a shit otherwise.
No no, I was now a golfer who cared about his swing mechanics, blew lots of money on newer modern clubs, buys golf books and magazines, and joined a internet golf forum

! I still have fun of course.
Earlier this year i met up with those same friends at the range and they were suprise how I was hitting the ball now. I tried to steer them toward trying a lesson or at least getting a book, but they just don't care that much it seems. Maybe a few more buckets of balls will help them straighten out that hard 80yd slice
I hope that explains some possible reasons for Driving Range Delinquents (LOL!)