Friends

? "!!" Triggers?
I can duo with my GF (THF + WHM or MNK + WHM), But i still have 2-3 other friends who actively participate. Mostly because we're all good RL Friends, but also because of things like Yellow Triggers for Seals/+2 Items etc. one is a BLM, the other is (albeit a bit more useless) a DRK/RDM/RNG (lawl).
I see no point to 18+ Man groups because its just unneeded competition, But some of them are smart about it (Split up to divide/conquer multiple NMs), so in a way it balances out.
I prefer low-man though :| 5 members max is my favorite.