Interesting point since half of it was taken from public domain code in the code archives.
And?
The entire point of public domain is that anyone can do whatever they want with it, no strings attached. It doesn't just mean that it's free -- It's perfectly valid to take a public domain program and sell it to anyone who is willing to pay for it.
If whoever wote it doesn't want that to happen, they should have published it under a more restrictive license (For example: Freeware, where the original author retains the copyright and can impose restrictions on how it can be spread)