Some of the checks added up to quite a bit more than that (if there's ever another error check for TeX it will be for $327.68), and one notable at a TeX User's Group conference stated that he had cashed a check for $40.96 and was grateful to DEK for it, since it put food on his table when he was a poor starving grad student.
And one of my favorite quotes on the subject:
> Intelligence: Finding an error in a Knuth text. Stupidity: Cashing that $2.56 check you got.
> — Seen in a Slashdot signature, quoted by Tess O'Connor ( https://www.stgray.com/quotes/programmingquotes.html )