What is Probable? (Part 2)

Further to the concept discussed in Part 1, regarding the Pick-A-Box Puzzle. There exist on the internet a number of forums debating this issue, and some of the arguments for the final decision of which box to pick, i.e. whether to switch or stick being a 50-50 decision are seductive, to the point where some people are simply unable to see that the choice remaining after a losing box has been revealed is far from even.