Yeah, I get it. It's more from when the game was new and there was only one or 2 species. I needed the game to make enough money for it to pay for the artist: is the explanation.
I have already said that in the next public patch, the public build will have all the species except the most recent one each time.
Thanks for playing!
(The next build has all the species playable (excluding the most recent; dragon) in the public build)
It's taking a while had to do major changes.