I'm one of them. I do this because of malicious adverts and because of tracking systems. These cost privacy, but also real money (a well-publicized exampple is ordering airline tickets)

> Do you like browsing the web where 80% of website's functionality is broken because you think its a good idea to browse with JavaScript disabled. Makes no sense.

I agree, it wouldn't make sense if people liked broken websites, and I'm pretty sure that they don't. But I think what you mean is that I should enable JS because it is in wide use. For me, that is not a good enough reason.

As a former web application developer, I do believe that most of those websites could do fine without JS!