Linden Lab now has four levels of account - Basic, Plus, Premium and Premium PLus.
Currently only Premium and Premium PLus accounts receive Linden Homes.
Consider offering a Linden Home to holders of Plus Accounts (lowest paid account tier) .
Limit these accounts to 512m² homes - which would also show a nice progression - Plus @ 512m², Premium @ up to 1024m² & Premium PLus @ up to 2048m².
This may serve as an entry to people considering a paid account, and help drive memberships. (Maybe limit to those Plus accounts who pay annually, or retain their account for a year or more, if need to be more restrictive)
Just me, spitballing.