they might get stamped by clubs or something but im not sure none of my money ever has stamps on it tho
I get a lot of 'www.wheresgeorge.com' ones. You can track your bill. I had a five that was in Germany for about two months.
well when you pay something with a 100 somewere that accepts them dont they mark them with a pen or something? after they check they are real of course
a number of reasons. a lot are stamped during setups - they can track money that way and know if it was used in a drug deal, use it as evidence or at least a lead
^They don't stamp money for that man the use the serial number. Only a dumb ass would accept a bunch of bills with stamps on them And those pen marks disappear after a little bit. I don't know what the stamps are probably just some random people. I sometimes write random shit on bills.
People do it to spread messages around. It's an easy way for advertising. Or people are tying to keep track of their money so they know if they ever come in contact with that particular bill again.