Yes. This month, I deleted and republished two stories that I'd run no less than TWO CHRISTMASSES before. I nearly didn't because I was worried about pissing off people with good memories who remember them from last year. So I started tentatively. My first Christmas story was well received, so I posted another.
You know what? Anyone who's pissed about this has kept remarkably quiet. TWO of those stories were BOOSTED! And neither earned more than about $2 until this month.
Some people say it's unethical, but no one is forcing them to read something if they can remember it from a year ago. Hell, most people can't remember what they read last week!
ps. I'm going to turn this into a story now.