Yeah, but remember that PlanZo caters to everyone, not only animal nerds. The casual player won't know what an Indochinese tiger is, but they'd recognize a Siberian or Bengal...I'm gonna be honest here, but most people seen to request the asian lion because is the first subspecie they can name, ans also because it's barely distinguible from the lion we have ingame.
If people really wanted a unique or interesting new lion, we would see the Tsavo lion be more popular (some could argue they already are ingame, but so does the asiatic.)
I mean, look at it this way: every single pack, even the extremely niche packs like Oceania and Southeast Asia, feature 1 or 2 animals that people will instantly recognize, drawing in all types of customers