That's my opinion.
I in-fact, aspire to be one.
I have met many of them. Some are greedy, most are not.
I've e-mailed (bordering of flame-mailed) the CEO of my own company (which happens to be a Fotune 500) and not only was I not fired, but he actually listened and made changes to the company based on my (and, I am sure, many others') input.
The world of business is competetive to be sure. There are a lot of things wrong with it, and there is stagnation, unfairness, corporate-ladder "climbing," and so on. But it is not a world seeped in corruption. Everyone in the corporation is not out to get you. "Back-stabbing" is actually a rare occurance.
The world of financing is not wraped in greed. In fact, the driving thrust is to "make meaning."
Exhibit A: Guy Kawasaki, a well known VC.
Exhibit B: Vinod Khosla, a prolific VC working for THE VC firm KPCB.
Although, a lot of speculation and gambling happens in the Market, its main function is to provide very quick arbitrage for what is being traded on the markets. It provides liquidity.
Imagine this ancient situation:
In City A, there is a market where spice is very cheap when compared to meat, while in City B, there is a market where spice is expensive when compared to meat.
A trader, decides to take on great personal and financial risk (call it speculating or gambling if you want) to try to make a profit from taking a trade caravan between City A and City B. He plans to trade spice he gets from City A for meat in City B, and bring it back to City B. He of course has to take care not to provide spoiled goods, lest his reputation (his brand) be ruined. Since he is a good and trust-worthy person, this habbit is ingrained him anyway (without needing to worry about "brand"). He has to fend of theives who have the same idea as him, but want to try to rob him instead of doing legitimate trading. He also has to face the elements, and manage the people in his cravan. Again, (without really thinking about "management"), he gives fair compensation to his workers because it is the right thing to do. Of-ourse, he has to get rid of the people who aren't putting in their fair-sare for the good of all the others in caravan.
The modern situation is not too different. Things just happen at a much faster rate. Instead of caravans, we have trading houses, investment banks, individual investors, and various other such firms.
Like in the old days, this breed needs to be quite tough. There are also corrupt people among their ranks. However, the most successful are the ones with altruistic aims.
If a=b, b=a. If what is best for the individual is best for all, what is best for all is good for the individual.