They say it's to prevent people from signing up, grabbing all the images and reposting them, and then cancelling the subscription. Which I get, this gallery gets grabbed everytime I post new work to it and reposted on different websites for downloads usually within a week or so. You do get the last three posts right off the bat, and since each post is 28 images on my page (each cominc is between 150-500 images total), I don't worry too much about it.
Sin ce it's been commented on so much, we've taken the trust period down and are going to see how it works out!