Not true. Most are, but some are original. Some are lithographs, some are seriographs. Most are not
one-of-a-kind but rather part of a series (i.e., one of 50). Some are both - most of the Peter Max paintings are part of a series but are hand-embellished by the artist so each is unique.
I've not spent as much as the original poster, but have bought art on several Princess cruises with no issues. We did, however, do our research both beforehand and during the cruise (internet cafes are wonderful things).
I can't help but wonder if these particular problems are due to the particular ship rather than Princess in general...maybe just got a bad art auctioneer?