Pretty sure you'll get a lot more responses from recent Viking Ocean cruisers if you post on the Viking Ocean forum on Cruise Critic: https://boards.cruisecritic.com/forum/689-viking-ocean/
How does the booze package work out pp/pd? How many drinks and espresso based coffee do you average per day? Once you find out the prices for the drinks you will likely be ordering , it should be easy to figure out the value of the booze package. If you can't find beverage menus on the cruise line website, someone on the Cruise Critic forum will likely have a link to one.
We haven't sailed on Viking, but have been on several other lines. Alcoholic drinks are cheaper if you order from the well options. But once you start ordering premium labels, the prices can rise substantially. Regular hard alcohol drinks might be $9-12 (depending on the cruiseline). Premium drinks will be higher. And there will be some fine liquors that are higher still. For instance, DH likes a nice single malt scotch before bed. His preferred drink was over $30.