Let's say that the e1 has 2000 dollars. That means that the other envelope could have 1000. And what if the first envelope has 1000? The second one could have 2000. Same thing, but with different envelopes! In an infinite number of possibilities for the contents on the envelopes, it dosen't matter which one you pick, as there are equal odds of anything from 100 to, theorically, infinite dollars being in any envelope.
This reminds me of that mathematical paradox in which a contestant in a game show is asked to pick a door from three doors, two of them have nothing behind, the other has a prize. After the contestant picks a door, the game show host opens yet another door, showing it to be empty. Now we have two doors, the one the contestant picked, and the other one, still unopened. Should he change his mind and choose the other door? And why?
Surprisingly, the answer is YES he should. I'll have the answer here later.