We have this Lee...

Some sites will sell very well with new signups, members will purchase a one month membership.
Other sites, members stay a long time. For instance:
EthanArmstrong.com - They will sign up for a one month non-recurring membership. (not all, some get recurring and stay longer).
Whereas, GayBarebackVideos.com - They will stay for months. We have some members that have been recurring now for over a year.