"Selling Out"

This is not about a particular book- I'll delete it straight away if it is not wanted because of this!

A lot of people have opinions on artists and "selling out", or (roughly) recieving money for mainstream media that is not within the artists' expertise . What is your opinion on authors selling out?

I was recently crushed to discover that Francesca Lia Block, my favorite author alive today, was developing a series for MTV and a cinema version of Weetzie Bat. Perhaps that is because Meg Cabot (author of my former guilty pleasure, The Princess Diaries series) made two movies that beared no resemblance to the books that they were based on, then started churning out books that would appeal to the masses and not the loyal readers that she had before the movie contract.

Or is it because deep down, we all wish that popular books were really our own? Anyone who's read Siddalee's library experience in Little Altars Everywhere understands what I'm talking about! Perhaps I'm just being elitist. I know what kinds of shows are on MTV, and I don't want people tuning in to watch Direct Effect just to half-heartedly enjoy the stories that I've loved so much.

But enough with all of my opinions! I want to know what you guys think.