A person of select and unique skill sets needed to handle tough clients and is generally hired by Corporate America to solve problems which save or make money. These same clients or management may someday turn on them for unknown reasons at any time, eating them for lunch. The Sea World Trainer is considered disposable with few lasting benefits, recognition, or legal recourse. Sea World Trainers also live for the glory, and usually die without any.
John used an exciting new format for the ad, but the moron client found it objectionable and chewed him a new asshole, and management fired John without notice to keep the money client happy.