When you can get a 10-day Baltic cruise on the brand new Seabourn Sojourn in a 300 sq ft verandah suite with alcohol and gratuities for $3960 pp I think you are honing on at least some Holland America cruisers.
Yachts of Seabourn - Luxury Cruises
This 12-day Holland America Baltic cruise in a similar sized suite is $3999 pp.
Cruises on ms Eurodam, a Holland America Line cruise ship
The point is that as you get into the longer and more exotic itineraries in the nicer cabins on HAL the more the experience becomes like Seabourn (quieter, focus on destinations, onboard enrichment, etc). So, the upsell gets pretty easy.