I'll rather demonstrate supply and demand to you: there's supply of my attention. I give my attention for satisfaction of communicating to someone or reading something interesting, maybe learning something interesting. Your first comment gave me that satisfaction in the form of the humorous contrast between a user named "commie" being pretentious about economics. Your second comment I've spent my attention on, but there won't be a third. The supply of my attention, my demand for satisfaction from yadda-yadda-yadda balance out the way that I'm blocking you.