The book was carefully authored in order to attract as much sympathy as possible while swelling the coffers of the fund. Promoting the book and thus Madeleine took a back seat evidenced by the threats made against anyone who posted a copy of the book online.
As for searching, despite their talking the talk, the McCanns have never taken part in any organised search since the time of the disappearance. They want everyone else to search for Madeleine while they concentrate in attempting to destroy anyone who dares criticise them.
After the Amaral trial decision Kate McCann went public to claim that it wasn't about the money. We shall see how much of it is given away to a worthy cause if the appeal decision is favourable to them.
Kate said she wrote the book to put their side of the story out there. Also to raise money for the fund, obviously if someone posted a copy of the book on the internet others could read it without buying it, and so the fund would suffer wouldn't it?
As for the searching part of your post. The McCann's searched everywhere they thought Madeleine could have wandered, the same as other parents of missing children. They then waited for the police to arrive. It is normal for the police to then take over the search, it is not normal for the parents to be among an organised search as they could come upon the body of their child.
The McCann's ask the public to look out for Madeleine when they go on holiday, that is the only way they can now 'search' sightings, that is all they can go on now, which is the same as Ben Needham's family.
