Wow. I passed through there back in May this year and none of the toll booth information signs were on at any exit, and I was never directed into a toll booth as I traveled around the loop.
I figured they hadn't started collecting yet? It is a nice road, but a bit far from the city in my mind, mainly because I've never been to Denver and wanted to get a better peek at the skyline, but the loop is too far away.
But...question to the OP. Did the reader boards give you any idea that the entire loop route would end up costing that much? I went for miles on that loop before I found any signs indicating I was even ON a toll road, much less how much it was going to be.