Well, now...
I don't think a $49 K4 is a foolish buy.
There's always something better just around the corner: non-fools buy what they need when they need it.
Admitedly, if you don't need it right away, it is foolish to buy any electronic gadget to stash it in a closet for months. But even the fabled "Nite-lite Kindle" is 6 to 8 weeks away; you can read a lot of books in two months...