It only counts as cheap if the value of those 4 hours/day of sedentary activity is greater than $4. Many would argue that it is not. But I understand you're saying that relative to other forms of entertainment it's "cheap", I'm just questioning the price relative to the value of the product itself.

Also, I know a lot of people argue that watching TV can maybe relieve stress in some way, or allow them to "wind down" after a "long day" at "work", but I'm not sure you need to wind down for four hours (not saying you are saying that).