Thanks for ruining my game HBS/Paradox...
Like....they're PIRATES dude. Here's the thing with what pirates want:
A- They want to screw you over
B- They want to screw you over
C- You're trying to kill them all the time and they want to screw you over.
D- You're trying to kill them all the time and then SNITCHING on them to the great and minor houses and they want to screw you over.
E- They're pirates and want to screw you over.
Honestly the best price you should be able to get from a black market is like 100% normal price. With no positive or negative rep it should cost 500% over normal. It's an illegal market you have to pay extra for that at all times.