Harem Hotel is a linear story, so story changing decisions don't exist. And when a character doesn't pay for rent in the story, you don't get the profits.
I plan to add a farmable garden in the next update where you can choose to farm profitable crops.
Harem Hotel is a linear story, each action and sentence you see is meaningful. Adding optional branching story paths like these would detract from the larger story and the specific developments each character needs to go through.
"Friendship" was replaced by "Relationship Level" in v0.15.
Locking a character behind X number of dates and thus making the player do extra work in order to play the story is not a desirable outcome. Optional stuff should stay optional. Stats will never unlock or lock the story.
Feel free to suggest ways for affection to be reduced, I've been adding more of those in recent updates.