These sorts of rebuttals about costs from colleges (not just Harvard) are often rather misleading when they claim costs only include things not covered by a "financial aid package", which is almost entirely comprised of fairly high interest loans (fairly high interest given they are close to zero risk as both there is no way to get out of them and most are federally guaranteed).
Harvard gives these numbers:
Tuition and fees for 2010-2011: $36,142
Room and board for 2010-2011: $12,308
Average financial aid package for 2010-2011: $41,300
This is presented to look like the average student pays $7150 a year to attend Harvard. (Not including incidental expenses, books etc.)
This is misleading because not mentioned is that the financial aid package typically includes a Pell grant of a maximum of $5500 (average $3,593), leaving the remaining $35,800 covered by loans at 8-10% interest. Other than the Pell available to low family total income US citizens, the financial package is not scholarship style grants that come free and clear. The student ends up over $140,000 in debt upon graduation and Harvard gets their entire $48,450 each year.
The term "financial aid" is intentionally misleading and used against naive parents and students in articles and personal exhortations to convince them that college is affordable to them. We don't talk about "financial aid" when discussing loans for houses or cars, that would be considered misleading by nearly everyone. Saying college is affordable because you get "financial aid" consisting mostly of interest loans makes no more sense than saying that mansions and Hummers are affordable because "financial aid" consisting of deferred loans is available so that you won't have to pay hardly anything during the first four years. Actually the mansion/Hummer case makes more sense since their loans are not ones you can not get rid of no matter what (not even bankruptcy) and that if you don't pay will cause serious legal problems like revocation of needed professional licensing.