If a trader stops quickly and doesn't fire at me I typically let him/her what they pay. "Pay me what you think will make me not blow you up". If they run/shoot/show no signs of RP I toss out the demand and open fire. my pirate has not tolerance for someone that's shooting at him, and doesn't really care if he gets money or blood, both satisfy him.
He is a bit confused though when the person whose ship he just blew up (and who's escape pod he shot) arrives 10 minutes later in a brand new ship saying "now you can't shoot at me". It puzzels him to no end and he mulls over the conundrum as he destroys yet another ship.
but back to the point. I will pirate anywhere from 500k to 20 million credits. Depending on the ship that the person is in, if they co-operate, and if he has a prior history with that person. And he will pirate you each time he sees you unless you make a deal otherwise (that's the 20million extreme, 24 hour pass for a trader). Now, with respect to Jinx, I totally agree and think that if Sirius was RL the economy would collapse due to over-inflation. But...in-game mechanics don't work that way.