Well, of course it's fickle to define what exactly constitutes changing the world. As per the butterfly effect, anything could be said to change the world, but let me attempt a definition: I'm thinking it has to be major (substantially different from what was before and affecting a lot of people, most of whom are and remains perfect strangers to you), deterministic (ie. what you did caused the change) and lasting (still identified as a change by strangers at least a few years after the fact).

Making that kind of change is really quite difficult and requires both luck and financial success (which in itself requires luck).

That said, I think it's perfectly honourable to be a good guy and do a good job without changing the world. My argument is merely that in my view, changing the world is a quite higher bar than "just" being successful.