I put some cash into the game to get through the Zortah levels to find that I need 40 "uncommon" NPCs to advance. Awesome... I've got a dash of GP left over, enough for 2 full tanks of gas (about 7k energy total). I eagerly anticipated hanging a handful of uncommon pelts on my wall.
What I got was a sore clicker finger and ZERO mission NPCs. I did get 92 flamehawks though, so it wasn't a total loss.

(Actually it's 96 if you count the four that were already on my tab when I started.)
If only I had seen the signpost 100 levels ago that said, "ATTENTION: SEVERELY REDUCED GAME ENJOYMENT AHEAD"
I suggest that Flamehawks go from "Extremely and Ridiculously Common" to just "Common". That would be a nice start. I don't dare dream they'd ever become "Uncommon", since I don't ever get those.