I am not certain whether I have overlooked something, but it seems a little harsh that only the ministrorum and the nobility can afford to live for a month on their monthly salary. Assuming you take the worst possible accomodation and provisions, only these two classes would be able to get through the month. And should the nobleman dare to try and upgrade his lifestyle to medium, he would be broke after 2/3 of the month.
That is not considering how much stuff like Rotgut or Lho Sticks cost, something Guardsmen abuse fairly regularly. Imagine a soldier who can only afford to get drunk once a month, and who has to throw away 2/3 of his pay to do so. And playing card games with Lho Sticks as currency is actually far more costly than playing with real gelt.
I think the amenities pricing needs an errata. Urgently.