Michael, I generally agree with what you post but I have never heard of a hired skipper getting tipped based on the cost of the charter. As a Example a cheap monohull can be had for 2000 a week and that would put the tip in the 200-400 range. A large expensive cat could be 15,000 and the tip would be 1500 to 3000 for a skipper where the fee to hire him is only about 1200 to 1500 a week. His job is the same with either boat and his living accommodations are likely to be better on the cat.
Based on what your posting the tip for a hired skipper just driving the boat around would be much higher than the normal crewed charter tip after it is split between the Captain and chef not to mention they cater to your every whim including cooking all meals and cleaning your cabins, heads and even making the beds. I don’t think a hired skipped rates a much higher tip than a full service crew.
G