Because they find themselves in a discussion online with someone who has demonstrated by multiple remarks that s/he has little to none and they are trying to indulge the individual. You surely don't think I present the graphs and so on for my benefit? I'm trying to get you, in particular, to the point that you'll have a substantive conversation about the topic, but you seem unwilling to present anything having the gravitas needed to credibly counter the validity basic economic principles, yet your remarks are ones that challenge those very principles and you expect me to accept your ideas without the content that is the comparably rigorous (mathematically) counterargument to them. Not in this lifetime will that happen. When you have something of weight to offer, I'm interested. Until then, stop wasting my time.