Ghostwriters

What makes writers 'ghostwrite'? Would they not want their own identity to be associated with what they could write or do they also write under their own or a penname? It sustains the lie that a well-known 'celebrity' can also be an author when clearly these 'famous' people don't have the ability or diction.

Maybe they do, so why does a publisher employ ghostwriters? If the well known 'name' attempted to write, it would almost certainly be a literary disaster. These first-time writer 'celebs' produce a 'bestseller' according to the publisher.

Well, I suppose they have to try and get something back for the financial risk involved.