The IRS report for the richest 400 Americans shows that only 6.5% of their income came from wages and salaries. The rest - 93.5% - came from unearned income. "Unearned income" is the profits that accrue to the rich by virtue of their ownership of things. When corporate profits, for example, go up, the wealth of the rich increases.
The rich themselves do not create those profits, though. The profits are mostly created by the people who work at the corporations - the profit "creators", so to speak. The rich benefit from the hard work of others, but they mostly don't participate - not unless they feel like, anyway.
Link:
http://www.irs.gov/pub/irs-soi/07intop400.pdf
You bring up an interesting point about "unearned income" which I feel is quite often misunderstood by many people. The underlying assumption in your argument is that unearned income is somehow unjustly acquired, and that those who obtain such income do not themselves create it, but take it from hard workers. Therefore, the income should be redistributed.
Unfortunately, calling unearned income "unearned" is a complete misnonmer, and overlooks how that income comes into being and the vital purpose it serves in the economy. The only reason these workers have jobs and produce products in the first place is because some investor provided the company the funds of doing so (or the company had the funds left over from profit).
"Investors do not produce any actual physical product; they make the planning of production more rational. The efforts of "workers who produce real goods" are wasted if production plans are defective. Successful capitalists can shift production toward goods that consumers want most urgently. Profits derive from the sale of goods that garner the highest revenues from consumers over costs. Few people can predict market trends. Investors can earn or
lose billions because their decisions determine whether the work of millions of ordinary people is productive or a waste of time."
Unearned income is, in fact, earned. Without it, an economy would cease to provide goods people demand. This is precisely why the soviet union failed and people suffered such poverty. Government planning is far inferior to entrepreneurial planning driven by profit.