Minimum Subscription Cost
From FAS Virtual Worlds Almanac
The Minimum Subscription Cost is lowest cost someone can pay to have and maintain an account on a virtual world for as long as they wish. Many virtual worlds offer a free subscription, but these accounts usually do not have all the features of paying accounts.
If a virtual world offers a free trial but requires all users to pay after the free trial is over, the minimum subscription cost is the cost after the free trial.