Let's be fair. As someone has already pointed out, the difference is $300 NOT $400.
Then account for an educational discount that is $50 higher for the 2.4 than the 2.0 ($100 v. $50), that brings the difference to $250.
The hard drive upgrade to bring the 2.0 to the same specs as the 2.4 (I needed the larger drive) is $68 (it cost $90 when I bought mine), making a difference in real dollars of only $182.
That is the apple-to-apple 😀 number to use for comparison for the value of the faster processor and illuminated keyboard. Not $400. 🙄