Which of the following can lead to the revocation or suspension of an auctioneer's license?

In the context of maintaining an auctioneer's license, actions that are considered unethical or deceptive are taken very seriously. Incompetence and efforts to deceive the public undermine the trust and integrity that are crucial in the auction industry. Auctioneers have a responsibility to conduct their business with honesty and transparency. Engaging in deceptive practices not only harms consumers but also damages the reputation of the industry as a whole. For these reasons, such behavior can lead to the revocation or suspension of an auctioneer's license.

While certain other actions, such as failing to pay sales tax or not participating in continued education, may carry consequences, they are typically less severe compared to the harm caused by deceptive practices. Overpricing items at auction might lead to market issues, but it does not directly violate ethical standards like the deliberate deception of the public. Thus, the emphasis on ethical conduct underscores why incompetence and efforts to deceive are particularly serious offenses in the eyes of regulatory bodies.