Why traders don't pay?

[The Savage]

On some imaginary Banks computer. Would they permit criminal organizations like the Rogues to operate through them.

The answer is: Lane Hackers.

Also since when and Junker can pirate in the house systems ? a pirate demanded all cargo or die he killed one of us in Omegas i could manage to run to pool then to Dublin.

If piracy chase started in non-house system, the Junker has full right to chase you down even to the house systems, as it is continuation of the engagement - with rules not being broken, as piracy started in a system depicted by ID. If target, however, leaves Junker scanners for more than 2-3 minutes - target has escaped.