a quick search of interline eligibility for Crystal brought up this:
- Past guests who are Crystal Society members are eligible for Interline rates unless they have, or have had, a full-fare reservation on the desired Interline-rate voyage.
The OP needs to get over it. Interline is a generous discount that comes with restrictions.
Don't like it? Then take your business elsewhere, as you have indicated. But to throw a tantrum about the published rule is juvenile.
And I agree with cruisr above about some of the airline captains who indeed have a superiority complex.