I think the reason why they aren't popular is because they suck. The don't let you do the one thing that you'd really want to do when creating a memorial. They

I think the reason why they aren't popular is because they suck. The don't let you do the one thing that you'd really want to do when creating a memorial. They don't let you collaborate. If I was creating a memorial for someone I would want to solicit stories and memories from the person's friends and pull them together to form a story.