One thing I've been thinking about in regard to many users paying proportionately higher tier as opposed to one user paying a discounted tier are support costs.
It costs a lot of money to staff support and the more small scale land users there are the more those cost rise for LL. Even a premium member with no more than the included 512m is entitled to file a support ticket which has to be reviewed by a paid staff member correct? One person in SL who owns a sim(I wish) could actually be *saving* LL money(even with the discounted tier) because that is only one person potentially contacting support about an issue like lag or a region down--as opposed to the potential of 128 support tickets that could potentially be filed for the same problem in the same region.
Also, theoretically a person who owns a lot of land and rents it out could also be a financial boost to SL since many support requests are for very basic questions that an experienced land owner could answer for the tenant--thereby bypassing the need for support altogether.
Now, its been said that LL is trying to raise the number of premium accounts and that certainly appears to be the case--but they could they also be raising support costs?