[BruceZ]

Note that the choices "a number larger than a billion", and > 1,000,000,000 are the same, unless we are British, in which case a billion is 1,000,000,000,000, or what we call a "trillion" in the US. Hence the amount of the prize is also ambiguous.

Also note that if I had a billion dollars waiting for you, and that you would only need to drive to where I am to pick it up, then the persons who would not even roll a billion- sided die also better not come for their cash, since they would be taking a bigger risk than that just by driving.

Similarly, I wouldn't expect those people to be found riding a roller coaster and taking approximately a 100 million to 1 chance of dying, just for the fun of it.