I predict the majority of these clueless drivers you are seeing never read, learned or tested for the boater exam - their buddy or relative tested for them and basically handed them the certificate. Those people will never learn anything since they are "set for life".
If anyone went to the required state exam course, the marine patrol officer quite clearly stated: If you are towing a skier, tuber or any object, you must now maintain an additional 150' distance between the person/object in tow and another boat or object in the water. Thus, when towing skiers, your distance becomes 300' to allow for the skier and the boat. If in doubt, call any marine patrol or read your manual. Once again, how will marine patrol pull the ignorant off the lake with life time certificates or give fines for violations when they lack sufficient boats and officers to patrol and see these dangers drivers. Some things will never change!