Good point, Streamline. I would add to that...
"If you approach being a professional pilot with the attitude of a cowboy you will never be safe."
There are very good reasons for the speed ban below 10,000. In fact, in aviation there are usually very good reasons for most of the rules. And anyone who chooses to break the rules can expect no sympathy if his negligence causes an incident or worse.
I have seen one or two comments here that imply that the writers think this rule is petty and silly, and that anyone who reports a breach is being petty. I would be worried flying with people who have such a cavalier attitude to flight safety.