The big question is how many times to press it. Once at least is a given. It does specify the death as gruesome, so I don't really want the death, but I'd also like enough money to not have to worry again until a non gruesome death.
Like, if it was painless death, I'd probably say something like 20 or 30 times, but with a gruesome one...maybe 5 max, or perhaps even less. Still, one or two pushes is a given.
It can be both gruesome and painless. Something where you wouldn't even know what happened, but the person unlucky enough to clean up would be scarred for life.
It's also a gamble because you might get a painless one but also could get one that is insanely painful. Those odds aren't clearly defined and quantified like the button's odds.