Why does it violate the Consumer Protection Law to say, "Please count the money and things in person, or you will be at your own risk"?

This is because this prompt excludes the main obligations of merchants, and merchants should ensure that their goods and services meet the agreed or relevant standards, not because consumers have not put forward or exempted their responsibilities on the spot. For example, if the consumer does not unpack the goods on the spot when buying them from the merchant, and finds that the quantity or quality does not meet the requirements after returning the goods, the merchant may be required to bear the responsibility.