Why I will never write a travel book

Watching the trailer for Eat-Pray Love. I recall an episode of the old Taxi, where one of the female cab drivers (forgot her name) is trying to talk Alex into taking a trip to Europe, and he says that he will end up sitting in a cafe writing postcards while she will be dancing on tables. And they go and this is what ends up happening. So this is why I will never write a travel book. Because no one would buy a book tilted Sit-Write Postcards-Regret Wasting the Money.