Why doesn't someone make a movie of David Eddings books?
Maybe he won't sell?
Perhaps they have not been read by the right person.
Fantasy is often a hard sell to Hollywood, and usually has to gain "classic" status before it is seriously taken on. Remember that, despite sales of hundreds of millions of copies, it took 45 years for "Lord of the Rings" to be given the full Hollywood treatment.
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them