With finite currencies like the gold standard, oil standard, or Bitcoin, there is always going to be a fixed upper limit on wealth.
You don't understand what wealth is. The value of money is determined by what it can buy. To give a monetary example, consider a world in which the total money supply is $1 million, and the only worldly goods are fish, of which there are 1 million pounds. Under those conditions, people might be willing to trade 1 pound of fish for 1 dollar. Now consider a second world, in which there is $10 million and 1 million pounds of fish. In the second world people would probably trade 10 dollars for 1 pound of fish. The people of the second world are not ten times as wealthy; their wealth is the same as the first world because the supply of material goods is the same.
Money is not wealth. Money is a measure of wealth, and the quality of that measure is questionable. Money is a medium of trade, making it easier than barter to exchange goods and services. Good money is durable, divisible, stable, and fungible; good money allows a person to trade a lot of labor for a lot of money and save some of that money for food, clothing, and shelter later in life when he's no longer able to labor effectively.