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No, because it's too hard to hide, and deaths are harder to cover up than other sorts of crimes.
Rich people unironically just arrange gladiator matches on islands through conventional means. No need to do it in private.
They literally pay beefy guys tons of money to fly to this island and hit each other in the head until one of them falls unconscious, and it's a $1 trillion industry with massive crowds. It's just like ancient Roman colosseum matches except they only die during the fights sometimes instead of most of the time.