Can someone explain the mentality behind repricing stuff at checkout?

I work at a thrift store and have been in retail thrift for like 5+ years now (assistant manager at 2 different spots). And one thing I STILL don’t understand is why employees take stuff back from a customer at the register just to reprice it higher because they suddenly realized it’s “worth more.”

Like… be so for real… we don’t get paid more if the store makes an extra $3-500 on one day. You have to increase your daily sales consistently. That one “big” purchase isn’t changing our yearly budget or our wages at ALL.

One time a customer came up with some Oscar de la Renta sunnies (all our sunglasses are $1) and they were sooo hype about the deal. I was like, “woooah you got a great deal then!” I LOVE when people find epic stuff. From a staff perspective, that’s what makes people come back.

I still think about the time I found a Rushton plush for $2 at a thrift in my hometown & that one good find turned me into a regular, and I still stop by every time I’m in town. Good vibes keep customers loyal. Bad vibes = they never return and they’ll definitely tell all their communities.

I just genuinely wanna understand why people do this. Even upper management, if anyone’s out here with experience or insight, what’s the reasoning? Am I missing something??