For some, they don’t want to leave their home server and the ties they have made there for a raiding FC—back before cross-server was even a thing, if you wanted to raid on Aether, you moved to Gilgamesh or Sargatanas, and you gave up playing with your friends on your home server in order to do so. That’s not an easy decision for some people—not everyone wants to leave behind their friends on their home server for that, and not every server had a large raiding scene (Cactuar didn’t have a large raid scene until Creator when cross-world became a thing; it’s since grown and does quite well, but it’s still no Gilgamesh or Sarg). Hence why they join a cross-server static.
Not every FC wants to be a raiding FC either—my first FC on Cactuar had very few raiders, and my second one that was all friends had only one other person who raided; the others did not. Interests vary; it’s not that shocking of a concept.
Please stop being so short-sighted. Not everyone plays the way you do.
