What you are actually paying for
A private restaurant with table service every meal. A pool deck that never fills up. A lounge with an open bar. A butler who unpacks, books your dinners and walks you off the ship at the end. Priority boarding and a separate check-in lane.
Add the drinks package and the dining package to a balcony fare. Then compare. The Yacht Club is often within a few hundred dollars a person on a week's sailing.
When it is not worth it
If you rarely drink, eat at the buffet and are out on excursions every day, you are paying for things you will not use.
If the sailing is short, the daily premium is high. Three-night sailings are the worst value.
If you would rather have a small ship altogether, look at Explora Journeys or Seabourn instead.
Which suite to book
The Deluxe Suite is the one to price first. The Interior Yacht Club cabin gets you all the perks with no balcony and is the cheapest way in. Owner's and Royal suites are for anniversaries.
Deck matters. Some Deluxe Suites sit under the pool deck and hear the loungers being moved at six in the morning. I have stayed there. Ask me which cabin numbers to avoid.