Per this thread: https://xenadmins.com/threads/trophies-how-useful-are-they.401/
trophies could be utilized as more of a rewards system that unlock specific perks. Currently, there is only criteria for trophy points, as far as I'm aware. For Q & A style forums, trophies could be awarded to people with a specific amount of answers given in a particular forum. For example, in a forum about Microsoft Windows, they might be awarded the "Windows Guru" trophy after x amount of answers given. It can become a game, some type of motivator for people to post.