I don't think FFX-2 was "necessary" as such, they could have left FFX as it was, and a lot of people would have been happy with that ending.

But personally I wanted a sweet romantic happy ending, so I'm glad that they made FFX-2. I don't think the story was over, although it could have been, I'm glad they decided to carry it on.

Also I loved FFX so I'm not complaining about having a similar game to play, I'm glad they decided to make it, I think it's going to be fun and won't ruin how FFX was.

FFX's ending was okay as it was but...too sad, and I want to see them back together, hopeless romantic that I am so..yeah. They made a sequel, it's all good, play it if you want to, and those who don't like it can always just ignore it.

As for Square wanting money, most people in this world do things for money, do you think fast food restaurants feed us out of the kindness of their hearts? No, they want our money, but we still eat there. I don't think Square wanting money is an important issue *shrug*