Who said you don't add to NBC's bottom line when you watch television? Of course you do, otherwise they wouldn't show it. However, what you don't do is you don't improve the quality of their programming, at least not directly.

The equation doesn't change I don't believe, just it's implications. You no longer buy L, you have to earn it with K. Labour isn't free, even when you don't pay for it in money. Its dynamics are just more complicated.