Odds even out - they’ve got a second change(depends on their anatomy.)

Or human part will be alive, and not the horse part.

Yeah… honestly, it depends on how they’re built. Because it might work on one of interpretation of the centaur’s internal biology, but not on another. Still funny though.

They also produce both eggs & milk, thus they can be enslaved for infinite supply of omelette.

Or twice as many to sell. Now selling 3 kidneys per person won’t be a problem.

I am unsure whether centaurs have a joined or separate circulatory systems. Worst case - they’re separate for horse & human body. But if they’re joined, then I think a centaur may survive on 1 heart, as you’ve said.