Warren Buffet the number 1?

We know that money is not real, money is digit matter, I mean, in my way of thinking Carlos Lim, Bill Gates and Warren Buffet made a deal of "reaching" each one the top and "become" the most billionaire in the world. I think that they just cede their places to one another so they can be the most famous, after all THEY are the money lenders, the money holder on this planet.