Maybe, but from I hear and see, pirates overcharge.
The piracy amount should definitely not be greater than the cost the trader had to put in to buy the cargo.
So let me see, trader buys superconductors on Planet Denver to fill 5k train for 500.000 credits so he can only be taxed maximum of 500.000 credits on his way to Kusari
Then he buys engine components on Yokohama for 4.495.00 so he can now be charged 9 times as much on his way back?
It will lead to traders claiming that all their cargo comes from a base from an odd place in Sirius where is sold cheaply
I'm not saying I like pirates overcharging, I'm just saying it's really tricky to decide what is excessive and what is not