"My friend on $300k/yr ..." blah blah. Some people have real problems.
Even if you're making $300k. After taxes, your disposable income is still 5 - 6 years away from purchasing a home in cash in many cities.
We're using debt to fuel the economy, which is dangerous.
It's quite sad, because we've known how dangerous this practice is for thousands of years. It's not for no reason that usury is prohibited in the three major religions.