Taken from Princess website - The crew appreciation is a daily (adjustable) amount added to your onboard account and pooled in order to recognize the many crew members in the Bar, Dining, Entertainment, Housekeeping, Guest Services, Galley and Onboard Revenue areas and entertainment areas throughout our fleet who contribute to the guest experience. The daily amount of the Crew Appreciation is based on stateroom category: $14.50 per guests in Interior, Oceanview and Balcony, $15.50 per guest in Mini-Suite and Club Class, $16.50 per guests in Suites.
Noticed the statement "throughout the fleet" so any crew appreciation either through Princess Plus or added to onboard account daily is pooled from all Princess fleet and then divided out. If that is not an admission that it goes to enhance a very poor wage I dont know what is. About time in 21st century that all staff are paid a respectable wage accounting for where they come from and not have to rely on cruisers to pay their wages. Cruise lines employ them they should then pay them a decent wage.