As has been pointed out in the last few posts DCL does say that the Palo gratuitity is included: http://disneycruise.disney.go.com/faqs/onboard-services/gratuities/
Question
What about gratuities?
Answer
It is customary to give gratuities in recognition of service, which you will most likely be treated to in abundance aboard the ship. As a guideline, we suggest the following:
Per Guest per cruise 3-Night 4-Night 7-Night
Dining Room Server $12.00 $16.00 $28.00
Dining Room Asst. Server $9.00 $12.00 $21.00
Dining Room Head Server $3.00 $4.00 $7.00
Stateroom Host/
Hostess $12.00 $16.00 $28.00
Dining Manager Your Discretion
Room Service Your Discretion
Palo Gratuity included
Vista Spa & Salon Your Discretion
Babysitting Gratuity not expected
Shore Excursions Optional;
not included in shore
excursion price.
For your convenience, a 15% gratuity is automatically added to bar, beverage, wine and deck service tabs. All gratuities can be charged to your room charge.
Anything over and above the surcharge is appreciated by the staff.