Re: Silly...
"The dumb ones might take a few rounds to learn this but the lack of profit will ensure they give up eventually."
It is a universal rule of human nature. There is always a new set of people who think they see an opportunity that no one else is apparently exploiting.
However there is a school where they learn to avoid such mistakes before they would make them - it is called "prison". A friend who works in the probationary service says some of her clients were first sent to prison for a minor offence - and came out with knowledge of a wide range of criminal techniques..