Why I didn't pick F2Pers or P2Pers is because of what they stand for. Spiral knights is is a F2P game. You never need to pay to play. A person who buys something is just as equal as someone who does not when it comes to combat or level completion. The titles could make kind of sense but can be even more confusing than using easy to remember fox and wolf.
It's better if I explain it this way. The wolf will never buy anything but will farm till nights end but the fox will like buying things but will never farm for crowns for long periods of time so will always have a lack of crowns and needs a wolf to buy their fox goods. If you were a wolf, you will rather farm over buying with real money, and if you are a fox, you will want to buy something over farming for long amounts of time. So that's the cut, we as actual players will either farm a ton or actually spend money and will always rely on another player to do the opposite. A fox can always turn into a wolf and vice versa. One person who takes part of the wolf will always need a fox, hence the needed balance between them. The ratio comes depending on the player, are you more of a fox or more of a wolf?
Pertaining to Bopp's last paragraph, I have already mentioned how foxes need wolves to sell costumes to in my original post. And I left out the community part, since a fox can always get a community from other foxes. That's still a good point to bring up. I thought it was obvious that if the reader understands that a fox will attract a wolf and vice versa that the community will obviously grow. I focused on how an MMO economy can survive over if they can strive. Notice I put "economy" and not "community".
Note that a good economy will always spawn a larger community. Which I thought was obvious.
Your post has some good insights, but I would make a couple of changes.
I had trouble keeping track of which one was "wolf" and which one was "fox". I recommend instead "F2Per" and "P2Per".
The P2Pers don't entirely rely on the F2Pers for crowns. P2Pers also get crowns from playing. Toward the end you concede this point, that most players are a mix. But it's too late for me, because...
The real value that the F2Pers give to the P2Pers is community. Without a large crop of F2Pers, the P2Pers would have fewer friends to party with and a smaller audience for their fancy costumes. (Of course, a really big game is strong enough to skip the F2Pers entirely, but that is not Spiral Knights.)