A review of Dr. Seuss’s Green Eggs and Ham in The Wall Street Journal includes this:
The second way to interpret the book is as a celebration, albeit a mischievous one, of two particularly American traits: salesmanship and open-mindedness. Sam-I-am is the consummate entrepreneur, although, clearly, he does not believe in soft-sell. He is convinced of his product’s attractiveness, and the evangelism of his pitch is evident. He wants the Protagonist to “see the light.” However annoying one might be tempted to find Sam-I-am, he retains our sympathy for as long as his interlocutor refuses to try his product. How could he know that he doesn’t like green eggs and ham? Has he tried them? Why won’t he try them? What if we all refused to do things simply because we haven’t done them before?
It’s actually an interesting essay on the book.