Yup, sleeper fares continue to climb. And to clarify, there are 5 pricing buckets for each type of sleeping accommodation (and not 3).
Technically, there may be 5 bucket levels of sleeping accommodations, but on the busy routes all of them do not appear to be used. On some routes sleepers appear to open at a high bucket (or close)and stay there while on others like the Autotrain they are low during light demand and very high at peak demand. The amount of available sleepers, and season sales history, appear to now factor heavily into the formula.
What really puzzles me is that when Bedrooms sell for up to $1100 and roomettes up to $800; do passengers really buy at those levels? You can easily end up with a $1000 one way trip for two. Seems like a very noncompetitive form of transportation at these prices and a way to price the service out of existence.
In years past the private railroads ( and early Amtrak) offered sleepers as a low cost option for the traveler that amounted to a fraction of the price of the coach ticket. Today Amtrak sleeper cost can add 4X-8X to the price of the coach ticket. I guess Amtrak is trying to determine where the threshold of pain is.