Pokestine 40k members isn't small. xD Its not huge but its a pretty decent number. Most pet sites don't get this many members in my experience. However there's only like 2-3k active from what I've heard.
I've been a member for a long time, I'm Taxel (#6879).
But just a warning for anyone thinking of joining: Aywas is the opposite of the Area. People are not nice. I wouldn't recommend it for anyone whose fairly sensitive, either to mature content (the site is PG-13 and pretty much every topic has cursing and is okay for discussing mature topics) or just to rude people.
And a tip, if you do join don't make a Rant or ask for advice about pets or about trying to help wild animals (i.e. a lizard got into your basement and you want to get it outside so the dog doesn't eat it). If you don't claim to treat your pets better than your children you will be flamed and told you should never own pets and should get rid of any pets you have. Most of the super pet people also don't understand that sometimes things happen at a bad time (i.e. all vets are closed and your animal gets sick or your animal getting sick when you have no money for a vet even if you usually have vet money). ):
Aywas is a nice site with gorgeous art, but yeah. Its not child or sensitive person friendly in any way. I would hate to see a kind Arena member abused there.