As ABC always said, the perfect Dip game results in a 7-way draw. (That's why I've never understood a 7-way being regarded as the least valuable outcome in most eating systems. In my view, it should probably be worth more than a solo and certainly more than any other draw.) But no game is ever perfect.
However, it is not a question of ethics as to whether or not to eliminate players but rather personal morality. In my view, regardless of the scoring system, players should be playing to win. What constitutes a win, though, will vary by circumstances. In a tournament, for example, securing a part in a draw might mean qualifying for the next round. That could be seen as a win. Likewise, playing to maximise a rating score by not being eliminated could be a legitimate aim.
My philosophy is summed up by the phrase, "win if you can, draw if you must and survive when you have to".