Our Only Hope has just over forty players and has been clearing t5 raids at about the same rate that we can earn the bank coins to start the next one. We're looking to fill the roster with players who can get us into t6 raids within a week or so (a few of our players are still working on a 6* toon).
There isn't an outside comm, but the community is engaged even with the in-game chat. We love telling each other what works and picking up new tricks as well. We do have a minimum 2000 guild bank coins donated per week, but that's doable without spending a single crystal. We certainly wouldn't turn down a whale or two, but the priority for us is getting to fifty active and engaged players.
You can post here if interested, or ally me in-game. My code is 134-184-928.