Here's something a little crazy:
A copy of my book (the first one) at the massively inflated price of £29.99. On a cover price of £5.99, that's an increase of 500%. Why? Because apparently I've scribbled my name in it. When I did that with books at school they went down in value.
Thirty quid seems a bit steep to me.
Don't believe this is true? See it for yourself. Though I don't encourage you to waste your money. Buy 5 copies of the book unsigned instead, come along to one of my events and I'll sign all of them for you.
In different colours.
And with different people's names.
Anything you want.