2005 is quite out of date now, so I would take those numbers with some caution. The 2010/2011 numbers are a bit different.
Since you either didn't read or misparsed the rest of my post, let me quote myself:
There are a LOT of families that can afford that without dipping into savings and without blinking an eye. The last figures I saw are that around 20% of all American families make 100k or more a year. The most expensive colleges are still really expensive, but there is a HUGE diversity of colleges in the US from junior colleges and community colleges, to small liberals arts, to big state publics, to privates research institutions, etc.
1) There are a lot of families that can pay out 60k a year without blinking. This is true, and the number is certainly in the millions.
2) Over 20% of Americans make more than 100k a year. As far as I can tell from the 2010/11 data, this looks true to me.
3) You'll note I never said that a family making 100k a year could easily pay 60k a year (those are two discrete statements). Most families making 100k+ can easily afford some level of college.
Though I would add, as a minor nit, that in many, many parts of the country, $2000 take home cash a month is enough to live on and be comfortable.
To some degree, the horrifying student loan figures that are frequently bandied about are like the "average credit card balance" figures. After all, 1/3 of all students who go to college end with no debt at all! Only 10% end with 40k of debt, and fewer than 1% of all students end with 100k of debt. Source.
I'm not going to argue that college isn't expensive nor that 100k debt isn't absolutely crushing. I will argue, however, about the causes and reasons, and to a lesser degree the magnitude. To repeat:
Given the tremendous wealth in the US and the availability of cheap, easy to get government money, why NOT raise tuition? With very few exceptions (see Antioch), colleges and universities hardly ever go out of business or have trouble filling seats.