I have thought a lot about this, and here is what I would do.
1. Cut the number of apartments to 10, there are just too many now.
2. Lower the membership rates. There is so much free porn on the internet that it is difficult to justify $30 per month for standard and $45 per month for premium membership. With lower rates many more people may be tempted to join.
3. Minimize the number of apartments available to free viewers. If they aren't paying they shouldn't see all of them.
4. Rotate the free cameras through the apartments to give potential members a wide ranging view of the apartments, not just the living room or kitchen.
5. Promote the Gallery, but make it only available to members. Posting 30 messages or paying $10 to access the Gallery is to little when members are paying such high fees.
6. Allow paying members to vote the residents of one apartment out every 6 months. This could really promote interest in the forum as members campaign for the residents they like and against those they would like to see leave.
7. Finally, and most important to me, hire Vika as my personal assistant. I don't understand the hold she has on me, but she does. Her duties would include just what she does in her apartment, walk around topless or naked, make lunch, clean up, and make sure I'm comfortable.