Offer your thoughts or opinion on the input financial query or topic using your financial background.

The difference between Islamic Banks and Western Banks
To answer your first part, its not an opposition to profit. It's an opposition to usury - the practice of charging excessive interest on loans. There are extensive passages in the Qur'an condemning the practice, and in many cases "excessive interest" is any interest. To the second part of the question, these may well be more risky investments. But if you're trying to build a strong and thriving community financial spirit, one might expect there to be significant social pressures to use the loaned money responsibly. Additionally, while it removes some of the penalty for failure, it doesn't remove the rewards for success. The incentive is still there to succeed. It's merely the penalty for failure is no longer financial ruination. It may also temper the incentive for banks to give money to riskier borrowers, but rather to prudently invest in ventures with an acceptable amount of risk. The question as to whether or not this is a "house of cards" likely depends on the questioner. Whether or not this is also true for the western banking system likely remains to be seen, but it hasn't exactly been doing a sterling job of convincing me it isn't true for the past decade.