Well I'm not going to argue over whether it's a question of ethics or morals, but I don't mean that in general terms browsing is wrong.
What is wrong, is taking advantage of the knowledge and expertise of a shop & it's staff with no intention of purchasing the product from them. I appreciate that not many people will care either way, but there is a difference between doing that and just idle browsing or actually going in to perhaps buy something.
If people want to argue that is just free market choice and there is absolutely nothing wrong with it, carry on. In my moral code, you are wrong. But like you say fjtorres, tough sh*t for me then, eh?!