1. The answer should be about 1 for Player 1, about 3 for Player 2.
2. The same - closer to 1. 
3. The same - even closer. 
4. Yes - because 1 in case of player 2 occurs thrice as often as any 
   other face (on average).
5. Fewer sides - The difference caused by the additional weight tends
   to diminish with the larger number of sides.
   The DIFFERENCE caused by the additional weight on one side is 
   RELATIVE to the number of sides.  The more "normal" sides there are,
   the smaller the effect of the additional weight on one side.