As a very new owner (one month ago), I am interested in this discussion as to "how you handle the end of charter and also how well your yacht is cared for during its charter period". I guess I'm not aware about the impact I can/may have on this matter. BTW, I also became a member of sunsailowners.com. The fee for 4.5 years was very reasonable. However, I don't see any discussion/advice on that site either that answers your intriguing assertion.
Jim ("Anatolya", BVI)
I offer a perspective from having chartered bareboats down there and been curious who would want to own these boats with broken tables, and so much inoperative stuff. The answers I get from the Captains and tenders that are roaming around the docks is that stuff is fixed before the owners arrive.
My take away would be to try to arrive often.