Market research?

Today I was in a book shop doing a bit of market research on book prices, ahead of going to talk to a printer and getting a quote for printing my book. Then I came across 'Diary of a Wombat', a lovely picture book, which made me laugh so much I had to buy it. As I don't have anyone of the target age group to buy it for, I'll just have to admit that I bought it for myself. I think I'm just a lost cause when it comes to children's books, especially if they make me laugh!