You get 1$ for every M&M you eat.
HOWEVER. There is one M&M in circulation at all times somewhere on Earth that will kill you instantly. The M&M is harmless to everyone else. If someone else eats it, the killing power is transferred at random to another M&M somewhere. This happens constantly for the rest of your life. If the murder M&M isn’t eaten by someone (bag gets lost/expired/abandoned etc) , it will stay that way indefinitely, but you won’t have any way of knowing. Would you take this offer?