Ok, if we fallow that line, it's about worthiness in a certain region. And authors/sellers rarely implement regional pricing. Would you pay your one-month or even half-year salary for a random book? Same goes for software. That's why Microsoft encouraged or turned a blind eye on software "piracy" in developing countries, that's the reason Windows and other MS software became standards there. Most of users who "pirate" things won't pay a dime if you restrict it, they will just go find something else, e.g. Linux :)

> Would you pay your one-month or even half-year salary for a random book?

What on earth are you talking about? Books do not cost a half year of salary.

If they did, nobody would buy them.