The part I don't understand is why.
The store has convenient self-checkout lanes. They're dead simple to use, especially if you only have a couple of small items. You're not allowed to use them if you have more than 10 items though, so usually, I'm out of luck (as I tend to purchase more, especially after perusing the wine aisle).
But when I run in for one or two things...heck yeah...I'll zip through the self-checkout.
So why don't the people I noticed?
Most likely, they're afraid of the unfamiliar. People will go to great lengths to do things "the way they've always done them."
I'm guilty of it too. And I'm always amazed when I take the time to learn something new that saves me time, saves me money, or makes something simpler. I'm always left feeling sheepish that I didn't learn the new skill sooner.
Don't do this in your art career. Learn the skills you need to learn. They may be technical skills at the easel, marketing skills that involve new media or computer skills such as updating a website, learning photoshop, or improving your digital photography skills.
And remember, when someone asks you why you don't do something in the new and improved way, if your only reason is "This is the way I've always done it", then you are standing in a long line while the self-checkout lanes are empty.
Software Craftsman and Art Fanatic