I don’t know if it’s capped or not, but it’s based on the number of crowns you have.
I think the most it ever happened was about 4 times in one of my games *before* the last big update.
Maybe it’s a subtle incentive to spend on better upgrades instead of hording the loot?
In a single player game, there's no such thing as cheating. It's merely "creative manipulation of the default settings"!
