So... you'd "personally look the other way" -because this host isn't serious (somehow you know that), and they didn't pay $100 for a design or template ($100 is apparently the magic professional number), but you don't know if they're a professional company or not?
Me thinks Jon FB should wait for other replies.
Regarding your question...
((( 'Corporate' Postnuke Theme Developed by FlashThemes.com © 2002 )))
Is who designed and owns the design of the site. i don't know what would matter or not, and if people's primary buying decision rests solely on the copyright notice at the bottom of the site or not (though I have a guess).
If you want it to say something else, get another theme designed by someone else. What exactly is the question?