Even if I had to buy the wood from someone else, I took a $1 piece of wood and turned it into a $20 spoon. Wealth was just created without anyone loosing it. Wealth is infinite. Sure the amount of currency in circulation is finite, but currency isn't wealth.
> It is also important that, the more wealth you have, the easier it becomes to make more of it.
I agree--once you get to the point that you can make your wealth make more wealth for you, you've hit the point that you can scale beyond your time. Generally speaking having your wealth make more wealth requires investing your wealth, which is a good thing.
> So, indeed, the rich obtaining more of it does mean there's less for you and me.
This simply isn't true. See wooden spoon example above.