Static Yellow Pages ad or Dynamic Website?

The other day someone turned up on my door step to deliver the Yellow Pages directory. Personally I feel that printed phone directories these days are a waste of paper and a waste of money for Sensis to produce them. I can't recall the last time I opened a phone book to look for a number, years I would think. These days I, like many people go straight to Google and search for what I need. It got me thinking though...

Why do people still spend thousands of dollars on a Yellows Pages ad every year? Things in business change so often and quickly that a static ad that you place now is not necessarily relevant or correct in 6, 8 or 10 months time, but you're stuck with it. For around the same amount of money you can get yourself a new website that can reach more people (potential customers) and allow you to update it when ever you want. Maybe you have introduced new products, maybe you want to sell online, or maybe you just want to update the message you portray to your customer. With Australia being one of the biggest users of the Internet, and having one of the highest penetration of Internet use per head of population you're crazy not to have a website.