The chance of McMulin, Johnson or Stein winning are not 0.1%. They are absolutely 0%. It is impossible for any of them to win. If Clinton and Trump were both struck by lightning before the election, the winner would be a replacement Democrat or Republican.
Book-makers have to give a percentage chance to those candidates, but that percentage is a fantasy. The chance is 0.0000000000%. There is no chance whatsoever, in any iteration, that any of those three will be President.
Turning to Trump v. Hillary. I think a lot of people are going to lose a lot of money betting on Hillary Clinton