Bruce Willis net worth and salary: Bruce Willis is an American actor, producer and "musician" who has a net worth of $250 million.
I don't know how they come up with these numbers, unless Bruce Willis released these numbers by himself? With that kind of money he really doesn't need to do crappy movies.
They're generally wild guesses, though sometimes salaries for a bunch of films are known and they just add them together. You can probably see how that doesn't make sense as a "net worth" either - people waste their money and give it away, and they also invest it and increase it. So yeah, it's mostly just wild guesses.
Related, try looking them up for YouTubers, they're hilarious.
Mike Stoklasa, one of the founders and editors of RLM (they did the Plinkett Star Wars reviews, etc), has his listed as $18 million on one site. Another lists it as $1.5 million. Where does either come from? They don't list sources of any kind. I theorize they use stuff like Social Blade and Patreon gross intakes to make up something, but the thing is, they apparently never take COSTS into account. A place like RLM rents a studio and has three full timers there, plus equipment, and the general public knows none of the costs of any of it. So again, it comes down to wild guesses without much basis.