Is a Win-Win Solution Really Necessary?

SO, for the last couple of classes we have been doing some role play to practice reaching a win-win solution. I have personally enjoyed negotiating and such but every time we do, a question pops into my head; is a win-win solution ever really necessary in real life?

In the movie Wall Street, Gordon Gekko leaves a  memorable quote saying 'It's a zero sum game, somebody wins, somebody loses. Money itself isn't lost or made, it's simply transferred from one perception to another.' This line, I think is the reality of negotiations concerning money which is, well almost every negotiation. Everybody wants to win and I'm not sure if they consider a win-win solution itself even a win because some might say that a win-win is already a defeat for both parties. Even for the negotiation we had on Friday, we were careful to gather information so we could have a win-win but in reality, a WIN situation would be for Koji and I to have the best service at the lowest price say a 1000$ and a WIN situation for the other party Take and Robyn would be for them to give the lowest service at the highest price say 1600$. We finally settled on a pretty good service at 1200$(?) I think but my question is, how can that mean the same 'WIN' when there are other solutions that could be a bigger WIN. Is there a range of win like say it was a high-win or a low win...?

When ending wars, a win-win is definitely necessary because you NEED both parties to be happy in order to achieve peace. However, between corporations, you don't really need it that much because one wins and one sinks and that's all.

Gordon Gekko explains what greed really is in this video...

I don't mean to imply that skills to achieve win-win solutions are unnecessary. I'm just saying that from another perspective, always searching for a win-win solution may ultimately lead for your loss and that we gotta be careful.