In my case, finance. It's really not hard to make $300k/yr and the sky is the limit if you learn how to help generate revenue. You can do this in just a couple years easily. The problem is that (for me at least) the work is not satisfying (or worse) and the culture is terrible. Most people don't last all that long or aren't very happy.
The other way I've earned significant compensation is by being hired at a senior level, a VP of Dev or really any very senior technical position. At a company with money, these roles can easily make $200k in base salary, and much more with bonuses/equity.
The thing to keep in mind I think is that inflation is a very big factor. Making $120k in 2003 is effectively the same as making $150k in 2013. The numbers keep getting bigger, so $200k salaries really aren't that extravagant.
And it doesn't matter how much you make if you don't save. Plenty of $200k earners save less than $100k earners do. Anyone who can save $50k/yr is going to be a very happy camper in the future, and most young people could easily do that on $120k if they wanted to.