Marketing photos/humour

I am trying to market a humorous book. I am mainly relying on personal contacts and building a Facebook presence
http://www.facebook.com/AustrianWindows

People seem to like it. But whether people are really going to jump from chuckling at a Facebook page to parting with a sizable chunk of money, I am not so sure?

Anyone with ideas how to solve this frustrating problem? It seems to me you need to reach people who are into obscure book collecting.