Did one cruise in my early 30's.
It was free. Manufacturer paid for it.
400 people on a ship that should have held a 1K+ passengers.
Sucked big time overall except for the Mayan runs, Jamaican weed and catching a nice Wahoo in the Cayman Islands.

We must have been on the little ship that couldn't as we were late to every port by a good 6 hours it seemed.

Had a chance to go on an Alaskan cruise for free years later and couldn't decline the offer quick enough.
SF