Why window shop?

I was asked the most astonishing question by one of my friends the other day. To protect her identity she will remain nameless. She asked me:

"Tiffany why on earth do you window shop when you know you cannot buy anything?"

After recovering, realizing she was serious I explained to her that you have to be in the know, you need to know what you want and know where you can get it. For example I love the clean lines of an x ottoman. Like this one from Target

Or this one from Pottery Barn

If I did not window shop how else would I know there was only a $20 difference. 

Knowledge is Power.