When the user is created, a default search shall be saved which will allow the system to send an email of the prospective matches (with pictures) based on user's profile i.e. what the user is looking for. After seeing an email with the prospective matches, user is more likely to visit the site and hence this will increase site's revenue.
Right now this can be achieved by saving a custom search and its pretty hidden and not many users use this. They could still save additional searches through this feature though.