If you're a passionate collector of books signed by the author you may be interested in this piece in the Independent, UK which takes a sympathetic look at the "book signing chore" that modern publishing demands of popular authors.
Excessive success, however, can also be a burden. There's a shocking story about Stephen King signing books in a Seattle shop. He signed for hours until his shoulder ached and a publicist had to apply an ice-pack. Then his fingers dried up; they cracked and began to bleed, and he asked for a bandage. Hearing this, a fan in the queue demanded to have some authentic Stephen King blood on his book. Others joined in and he signed in his own blood for hours.
Signing off: the weird world of book signings
By John Walsh
Independent, Thursday, 21 August 2008