Hmmm. Although as in most 2p games, one's loss is the other's gain sorta thing... if it's X points to one and Y points to the other than the differential is X+Y, which is what it's actually worth to both players. So it seems to be a matter of managing the relative number of chips to try to get leverage.
Maybe the game was playing us.
For one thing, with two players you can calculate (at any time) how many chips the other player has in his hand. This is a substantial element to the game with 3+ players.
With 3+ players, you are often attempting to drive the price up of a card you know you want to take - but you aren't sure when the others will run out of chips and thus be forced to take the card you want.
Also, with 3+ players it is difficult to keep track of an exact score of a person (because it is difficult to keep track of how many chips they have in their hand).
With 2 players, this extra information may result in:
a) reduction in tension in the bidding
b) reduction in tension in the endgame scoring