If someone at Amtrak headquarters is listening, I have a couple of other similar ideas that can increase Amtrak's revenue-
1) Priority seating in Sightseer Lounge on California Zephyr out of Denver for the Rockies crossing. Get the best views, for $5 per passenger only!
2) Priority dinner seating. Makes sure all your favorite entrees are still available and hot. Again, only $5 per passenger!
3) Priority behavior - For only $5 per passengers per day, the onboard staff including coach/sleeper attendant, dining car attendant and conductor will not give you rude grumpy responses... wait, that's a bit too much to ask for!