Political discussion has, for a long time, been discouraged on HN. Down-voting is one way to encourage people to stop.
Also you'd be pretty hard pressed to say that this question isn't expressly relevant to the original article being discussed, and isn't overtly political in the sense that noone is agitating for votes or any such thing.
"Do buyers and sellers go to this man the way people go to real estate agents for their services? What would Craigslist buyers and sellers think of what he does if they knew about it? Respectfully, I think they would strongly prefer he weren't interfering."
"I doubt very much that sellers would appreciate this liquidity 'service' if it were spelled out for them. They would feel cheated, as would the buyers."
Pretty outrageous, in retrospect.
Two in just the past hour with a quick look at recent comments + one 40 days ago where I noticed it first started happening;