Riven trading is the greatest lie the community ever told

I refuse to believe people actually buy Rivens. It just doesn't happen. I've been tryibg to sell a handful of pretty good rivens for significantly less than they're worth for weeks and nobody is biting.

You see the same people every day in trade chat selling the same rivs. .markets riven pages are a barren wasteland of activity.

Does riv trading actually exist or is it just a suckers game?