That is interesting. On the Amakarerina we were led to believe that the two cruise directors, both about 21, in addition to the chef who should seek a new career path, were the only AMA employees. The rest were hired and employed by the Russian company, Vohodod, who owns the ship and runs the operation.
Suggested tip for the three "AMA" staff was $4 pp and for the crew $15 pp. Had to be paid in cash (rubles, $ or euros only) in two envelopes put in a box at reception.