I don't understand the difference in the levels? Can someone translate? I copied Marc's stuff and put it below for reference.

Member Benefits

Seven Seas Society Member (4-20 Nights) receive:

Seven Seas Society cocktail reception
Access to Seven Seas Society cruises including exclusive events ashore
Savings from 5% to 10% on select sailings
Inspirations magazine
Communications with advanced access to itineraries and special offers
Upgrade and referral opportunities on select sailings (per attached 2006 certificate)
Silver Member (21-74 Nights) receives everything for Seven Seas Members PLUS ... Silver Member

Gold Member (21-74 Nights) receives everything for Seven Seas Members PLUS ... Gold Member

Platinum Member (21-74 Nights) receives everything for Seven Seas Members PLUS ... Platinum Member