Generally, the more people there are in a room, the better the spawn is. However, I've been in rooms where the room is full, yet the spawn is completely not generating. A lot of these rooms have potential but the rate of spawn ruins that potential. If the spawn takes time to get better, it most likely won't get the chance to do that since most players would leave after seeing the lack of animals.
It frustrates me because this game requires players to grind for points and gems in order to level up attributes and skills but how can we do that if there is no spawn? Honestly the grind doesn't annoy me too much. It's the fact that the spawn is not great and doesn't help very much.
If there is a possibility that this could be fixed in the next update it would be appreciated by many(probably all) of the players.
Also hi mattress if you're stalking here