We had a friend who went on a Holiday. She searched through the room rates in the internet and thought to go to the hotel and book herself thinking that its cheaper to go as walk in guest. But she was proven wrong. It did turn out that booking through the internet is cheaper than being a walk in guest. She also then found out that even booking through an agency would be cheaper too.
So, when you want to book a hotel, it might be cheaper to book online. Sometimes, they also have internet rates and promotions that you can avail.