A funny story...
Back in the 1990s there was a coin shop in the city where I lived with which I did quite a bit of business.
One afternoon, I walked into the store and the proprietor offered me a bumper sticker to put on my car:
"I BUY AND SELL RARE COINS AT
( XXX ) COIN SHOP"
Talk about an invitation to the crooks to follow me home!
I declined taking a sticker and explained why.
He looked bewildered until it dawned on him.
"Yeah, you're right, this is a pretty bad idea!!"
I'm pretty sure he threw them all in the trash after that.