Dionysus, I agree with you in part and disagree in part.
What does commitment mean? I think that to an extent, you have to be committed to your relationship, but to me at least, the first thing in my life is commitment to *myself* and my happiness. I can't be committed to anything else if I'm not happy in my own heart and mine.
I agree that to an extent, marriage is based upon sacrifice. But you can go to the extreme on anything...yes, there are things you sacrifice for the greater good of a marriage. However, I think there comes a point where enough is enough. I at least don't want to go through life sacrificing so much of myself for a relationship that there is nothing left of me. Maybe I am selfish (I probably am) but I truly believe that unless you put yourself first, you are really no good to anyone else. Also, with sacrifice there must be balance, because if one person is sacrificing a lot and the other isn't, it's really unfair and bound to lead to trouble.
I hope this makes sense. Today I have had far too much coffee and not enough food, and that tends to make me a little goofy.