Not really. As far as I can tell, the original artist wasn't selling his works, right? And apologies in advance to all the designers reading this, but the posters are a sentence fragment in a standard font. They're not printing off bootleg copies of the Mona Lisa here.

I suppose I'm being immoral and disrespectful, myself. Should I send Dos Equis a letter of apology, see if KC Green sells prints of his comics, and try to track down both the artists working on the Spiderman show as well as the person who placed text on this image? http://imgur.com/3CHhp

Let me know if I'm factually wrong in any of my statements.