Do books still need dust jackets?

If only I had such influence. I’d be rich, I tell you, RICH!

Yes, and they even have books that have covers to protect the dustjacket.

A dust jacket also makes it easy to change the look of a cover if the publisher wants to market the book differently. I am not sure if it is common but I did hear an interview with an author who mentioned his book was ‘rejacketed’ after it became a movie.

Wo-ho-HOOOOO there! Even a thread on dust jackets for books can start a flame war on the SDMB.