That's a nonsense. Money itself are not a goods, because they are worthless: you can eat those banknotes you have in your wallet or do anything usefull with them. They only serve as a symbol that allows more convenient trade of real goods. And I'm not gonna create any "widgets" to replace them, but still many people uses alternative to state made money, like Bitcoin. Thinking about money the way you think is a main reason of the current economical crysis.
>No they can't because you've bought up all the land and allocated all the resources despite using a small fraction of them.
Billionaires usually don't spend much on consumption, neither they keep their resources unused. Most of every billionaire wealth is his company, or companies, in which they employ thousands of people (giving them opportunity to earn for their living) and produce things that fulfill needs of millions. That's all they owe to the rest of society.