Why all labor needs to be paid through currency? Whenever I express my opinion to my friends, I'm in theory "doing labor" but with no expectation of getting cas

Why all labor needs to be paid through currency? Whenever I express my opinion to my friends, I'm in theory "doing labor" but with no expectation of getting cash out of it; instead, I'm getting paid by the satisfaction of hearing my friends' opinions on my opinions, and getting new information. Or perhaps simply changing the world a little for the better if my opinion can influence others to do good things. The old Internet was about that, the new Internet is about associating a microtransaction with every single piece of content.