The villagers scam the player all the time with emotional manipulation. "Would you please trade your princess sofa for this moldy tee? Pleease?"
I've learned not to carry anything interesting in my pockets, haha.
I'm so much worse, I charge as much as I possibly can before villagers won't buy my items.
I always test my prices via Re-tail and check often to make sure someone pays me outrageous prices for my stuff
Honestly, I never liked the whole flea market system in New Leaf. It just never worked properly. If I played the good guy and never pressured my neighbors to buy the items for sale, they would never get sold!! Whether I waited for a week naturally, or time traveled a week, the items would usually just sit there. I'm pretty sure I don't over charge that much...
So frankly, I don't feel guilty playing the Crazy Redd of the Re-Tail. Because if I don't, then nothing happens! : P