Charter Market

Hi All ,
I was wondering what the current state of the charter market is.
There seems to be an awfull lot of yachts available for charter.
How successful are they in getting customers.
Is it a buyers or sellers market . If there are too many yachts, do the owners have to offer "deals" . Which location is most in demand for charters. Also what happens to the crew if they can't get customers. Are they stood down, or kept on. Also , why are some yachts more popular in the charter market than others. Is it the yacht or the crew ??
I've also heard that the customers are expected to tip the crew at the end of the charter. This can come to $20-40K at 10-15%. Is this true ?