Sarcasm?
I like seeing players being able to XP or tackle 6 person content like Sinister Reign without needing hours to set it up. I like having a somewhat decent supply of Salvage/Dynamis/Adoulin currency available for sale on the server. I like seeing more than just myself at Azi/Naga/Quetz. All the content is focused around 6 person parties, but why leave it at that?
I look at it like this, those playing on the majority of underpopulated servers are more likely to call it quits than they are to spend $18 to move to Odin or Asura. I've seen more than my fair share of returning players lose interest quickly because of how difficult it was to find help for older content. Having to find new XP locations or team up with others trying to tackle the same NMs you are isn't a negative to me, it's a positive.
Expand your friends list, expand your horizons, see that there are still enough players logging in today in 2016 to make the game as interesting as it was back in 2003-2004, but see that it can't be done with 16 servers.