Something for nothing?
Do you know what inheritance is? Something for nothing. This is the entire reason capitalists stay rich. Sure some are able to move up with hard work from the lower class (like my dad), but they are extremely few and far between. Inheritance is just the means of old exploited labor accrued in a timely fashion and washed hands when passed down. Sure it's great for people to provide for their families but how is that any different than a free handout to a homeless guy?
You already said, you enjoy your computer and you enjoy all your nice things because you are in the minority of people that benefit from capitalism. Hence, someone in Ghana thinks differently about life and when Communism replaced the feudally outdated economic system they didn't complain to finally get an education and shelter.
I'm sorry you think that wages are determined by the market. You are about 50 years too late. The market doesn't decide wages. There are so many ways to refute this. Some terms you may want to learn...efficiency wages, surplus labor, re-switching effect. Read Paul Sraffa's Productions of commodities by means of commodities you may just learn something about economics.
I don't know how to put this in simplistic terms, but if wages were determined by the market you would be operating at full employment. Since it is obvious there are periods of structural unemployment and not everyone is voluntary unemployed. Keynes himself made this grave mistake in saying the market determines wage and that people are unemployed voluntarily. His entire life's work contradicts his own thoughts on employment. Rather sad really. There are certain micro-aspects at which a free market will determine an equilibrium, however wages, social goods, and anything on a macroeconomic level is not one of them.
With that said, I have seen some good posts and some horribly skewed visions of economics. For people saying that greed is human nature, I would argue against that. Greed in terms of survival is embodied in human nature, sure. We see it in the animal kingdom. However, the vast accumulation of capital that you guys are referring to (why communism won't work) is monetary greed. This is NOT human nature, rather it has been instilled in us by socio-economic means. Hence, fetishism of commodities. This is what capitalism evolves people into. Commodities are the most important thing in capitalism, thus as subsistence is provided (like in the US) the accumulation of commodities is devised as the most important.
The problem is not a lot of people in here can conceptualize any sort of form of communism. However, it is quite obvious a lot of people saying that capitalism should be the only economic system fail to recognize the true intentions/implications of communism. Now I don't have the time or patience to explain this so grab a book.