The last thing I'd do if I received free breakfast for 4 more guests (that weren't booked as guest of honor) AND chose to write in a tip is to raise the issue with the hotel or concierge (which may get charged back to the employee).
Workers at Andaz Mayakoba do not make much money, but everyone I have talked to enjoys the stable work. Many spend two hours a day commuting on buses.
This property has gone above and beyond before for us, including coffee at one restaurant, day of arrival breakfast buffet, and day of departure buffet on a one night stay.
/I'm in the "globalist-included" club. It has earned some curious faces when servers see this, but if they call or talk go their manager to clarify they have always had a smile on their face when done. The one exception is when I ask for and receive restaurant breakfast in lieu of lounge breakfast. In those cases I tip cash because I KNOW the waitstaff is not tipped as a matter of course.