Is there really a need for NPC to interdict 6 times in a single supercruise run?
The key question is "did you do anything to stop them doing it after the first time"? If not ... well, a hostile player in the same situation could have done exactly the same thing, and probably quite a bit more effectively than the NPC did.
If you do any of:
- beat the interdiction (easy versus NPCs with practice)
- force the NPC to flee to hyperspace
- trick the NPC into ramming a planet/star while they're trying to line up to interdict you
...then they won't reappear until you change instance (hyperspace, etc.) and if you actually destroy them [1] they won't be back at all plus you get paid.
If you just submit and low-wake, then the NPC can also immediately do the same and will be right behind you to interdict again. If you're really close to the station already it's a usable tactic, but only then.
If you're using supercruise assist, or manually flying with the "six second rule", note that these methods are designed to make you an easy target for interdictions. Other ways of getting to your destination - spiral approaches, gravity braking, etc. are both faster and make it very difficult for anyone without a decent Wide Angle interdictor (which NPCs never have) to grab you.
[1] So long as you get a few hits in, the system authority destroying the NPC also counts. If you're flying a big freighter with limited firepower, stick some pulse laser turrets on it, hire an NPC to fly the SLF, add a decent shield, and a bunch of hull reinforcements in the small optional internals which can't carry much cargo. In high- or medium- security systems, you should be able to survive more than long enough for the police to show up and scare them off, even without being able to fight them yourself.
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