Think I fknally figured out what happened with the brochure. Looking very closely at the "DISCOUNTED Fare Per Guest" heading, there is a tiny, tiny blob at the end. With a magnifying glass it appears to be an asterisk. So I looked and looked for a asterisk with explanation throughout the brochure. Finally I found some text on the back of the brochure in the lower right hand corner in a type so small and in a color so light that it is impossible to read with the naked eye. I had to use a magnifying glass to read it, and it was even difficult that way. It says fares apply to "select sailings" only, i.e., they are the lowest possible fare for all sailings.
So technically they provide the required information to understand the fares, but they make it extremely difficult to find and read. I find this very disappointing; and if not deceptive, at least very tricky.
LIve and learn, I guess.
Thanks for all the responses. They have been very helpful in sorting this out.