Chicago-NYP roomettes have not gone up so much as to be unaffordable (recall there was a thread discussion about the buckets and fare increases, pre-pandemic that was very interesting). However, taking the Capitol to connect to one of the Silvers had stopped being an attractive option, we had flown last few trips to Miami and will be doing so again out of Detroit. It became a question of saving the sleeper car fare, having more time at destination, and more money towards accommodations.
As far as the West Coast trips, I am so grateful we took the EB and SW Chief when it was affordable in either dollars or AGR points, because it's really not now... :-/ Amtrak is marketing these LD trains as land cruises, not about when you'll get there, so I'm guessing enough people are willing to pay for those rooms at the current price points. Case in point, the increase in Biz class fare on the Wolverine makes it completely not worth it, and they fill up the car anyway.