World: Under Me
How much Mental Energy could one harvest from a world?
"Not much!" Would be the answer from a Grade 1 System, for it needed at least two decades to harvest around a hundred thousand Mental Energy. Even in technological worlds, this was the standard duration required, not to mention in other less connected worlds.
After all, unless the target killed your mother, you wouldn't think about them every second of your existence. Even on Earth, as the richest man, at most Compass Carburettor made his way into the conversation of people once or twice a day, and that was only between people that constantly talked about people and the rich businessmen that dealt with money.
The average joe was busy making a living to even bother with such people who had more money than they ever needed.