what adds to the community if not builds and servers
Being pleasant, helping others in game and on the forums, making appreciated add-ons (to an extent), interacting with the community without causing large amounts of hostile arguments, etc...
It's like an actual town community. You actually have to be interacting with the community properly to add/be a good part to it.
Imagine if there is a baker in town, and he makes bread for the town and it's quite nice (but he's not the only baker, or even the best). Now imagine that he is rude to everyone that comes into the bakery, and after work he goes to the pub and spurts obscene remarks about groups of people and starts brawls. And he does it so much that the mayor even threatens him with eviction unless he stops, but he carries on anyway.
The baker isn't a boon to the community just because he makes bread, which we can get elsewhere.