Sorry, Ripped, to interrupt your wanting to step back to the main point of the thread, but I take huge issue with your stating "the purpose of the theater...is to be entertainment." Even if one accepted this to be wholly true -- which is a pretty tall order, considering that even the Greeks', when inventing modern drama, were following using the traditions of ritual, dance as spiritual expression, and the recording and enacting of culture history as a method of preservation and communication -- one eventually has to concede that definitions shift, and it's been about 2,500 years.
I can think of plenty of art not made with "entertainment" -- and I'm not even sure what you mean by that, entirely -- as its primary purpose, not to mention books, visual art, music. Art may engross, compel, fascinate -- even in vulgarity -- but is simple engagement the same as entertainment? What might engage you might leave me bored to tears, and vice versa. My sister loves the "Twilight" book series. I read a chapter of "Eclipse" and thought it was the most unengaging and tedious drivel I'd ever read and couldn't imagine a person spending hours upon hours with it. But millions and millions and millions of people -- some highly educated, oh, yes -- devoured it like candy.
I've probably watched "Un Chien Andalou" 30. Something tells me -- and I may be wrong -- that film was not borne out of Dali and Buñuel's saying, "Let's make something that'll really entertain the hell out of them!" It sucks me right in every time. My mother barely made it through once, and it's only 16 minutes long.
You just can't pigeonhole art -- any art, even theater -- into having a single or even primary purpose. I have trouble seeing how that's even an opinion. Someone insisting that the primary purpose of drama is to entertain or to do any one thing -- even if it's true of 99.9999% of all theater that gets produced -- is, to me, the equivalent of plugging your ears with your fingers and going, "Nah nah nah! I can't heaaaaaaaar you!"
It may be a primary requirement for you, but it is most definitely not for me and, I promise, many, many others. It just... isn't.
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