Earlier quoted context omitted.
Whatever happened to "caveat emptor"? If you're attending a real estate conference at a Ramada Inn, you weren't defrauded - you're just an idiot.
What happened to it was that credit card companies discovered that they could gain additional customers by removing that risk. The end result is now that most or all credit cards cover the cardholder in the event of a fraudulent purchase. Feel free to run your own conference where "caveat emptor" is the rule for buying tickets, but you won't be able to take credit cards or various other forms of payment for it.
What happened was that after defrauding customers became common practice, Congress passed laws regulating the credit card industry and putting the fraud onus on the party with the most ability to prevent it, the credit card issuer.