not that I would EVER defraud someone to whom I was selling a book, but I've always found forging signatures to be pretty easy. if you look at a signature and have the discipline to sign the name 1,000 times, you will be able to generate a fake that's way better than the two in this thread (and that awful Fante signature from a different thread).
that being said, Bukowski's is really tough to duplicate, because he writes out almost every letter in his name. The ticket is an author who jumbles a bunch of letters together, since that's fairly easy to sign quickly and without wobbles or starts and stops.
for the record: i don't recommend ever forging a name on anything to defraud anyone (i can't stress that enough). that being said, if this post is inappropriate, pm me and I'll get rid of it.