I don't get the complaint about Kappn Island and its beetle farming making money easy to get?
You can easily ignore that part of the game and make money through normal means like fishing, catching bugs,.. in your own town. That's what I am doing right now.
In the past, I used to rely on...
Other than building a PWPs in or near places where you don't want villagers to move in, or using the save editor and move their house manually, there's no way to prevent villagers from moving into certain spots...