In response to your question, I replied that I can vouch for it actually happening 1 time....and I also believe that people booked in higher suites should enjoy additional perks such as free admission to the spa area, earlier and more specialty dining reservations, earlier cabin availabilty on embarkation day....I never questioned those "perks" as I am not the OP.
This topic has evolved into a discussion on tipping/bribing which is what I commented on..