Autograph for sale

Apparently Joseph's autograph is worth £24.99 on Ebay!

It always amazes me that there are people who collect autographs to sell on. I assume that fans prepared to pay that much for an autograph wouldnt think to write a polite letter to Joseph, via his lovely agent, with a stamped addressed envelope included. They would probably get their own personal autograph and it wouldnt cost £24.99 + p&p.