Price is almost everything to many of us.
When Baen changed pricing on e-books to permit distribution through other channels, it hit hard on my
impulse buys.
To those of us in the USA:
Have you noticed your snail mailbox is mostly empty?
The price of stamps is one factor. (printing costs is another). Bulk mail Advertising has cut waaaay back.
Volume is falling: The Post Offices solution to declining volume? Raise Postage rates (again).
When I was a child a first class stamp was 3 cents (Air Mail was more).
If you
only look at the 'adjusted for inflation' numbers, the current rate looks great

The numbers leave out all the other (efficiency? We are talking USPS here

) progress in mail handling, the adjusted rates should have been lower.
Early color TV's were $600 (1956, unadjusted). Today you can get a 55inch HDTV for that amount. Progress:? Efficiency: yes