Without people striving to make a fortune lots of others would be without a job/product. Without greed we would lack some of the drive needed to compete in a global market.
Imagine if no one wanted to make big profits from manufacturing mountain bikes. We would all be riding 40lbs, sidepull braked, scaffold pole framed nonsuspension monsters. But no, due to profit motivated business people we ride great bikes.
Put it in perspective, the are millions of middle class and poor people for ever millionaire. Those same middle class and poor people were also benefiting from zero % credit cards, multiple income mortages and buy now, pay next year deals on stuff they didnt really need. Greed works for the poor as well as the wealthy. Greed is what kept the human race alive when things got tough. Everyone with a house was happy to see its value shoot up each year, they never said its bad and greedy then.
Stop moaning and go and create some wealth and spend it. Leave the boom and bust regulation to enlightened economists, the polititions wont sort it as they are too greedy for votes.