Andy, the Trophies system rewards members with virtual trophies and points for meeting certain criteria. It is also linked to the user title ladder, replacing the more traditional post count method. These criteria are defined as the multiple ones, for instance: the first post or the 500th one. Also likes you can be received with, including you are liked or not. The system takes into consideration the content you uploaded etc... Therefore the longer you are active here the more points you can get. The current settings for the system allow to obtain just the 113 pionts maximally.
The Trophy points are also used for the User Titles Ladder. The more points which are earned, the higher up the ladder they move, gaining the relevant user title as each threshold is passed. For instance the "Well-known Member" etc...
I hope it's helpful.