Chartering from Owner of Fleet Boat
We own a boat, Lagoon 410, in charter with Sunsail and I can assure you that you get same or actually better service than regular charterers when you book trough the owner and in our case a 25% discount.
The link with www.sailonline.com has all the information that you may neeed.
The only problem that we have encountered is that the boat is sometimes already booked when we inquire about any given time period and also the fact that we have only 4 weeks of personal use, so they sell pretty fast. The answer is to reserve early in order to get the timeframe you want.
Best of luck