What to do if you have PK trouble...
Offer $50,000 for someone to be killed and most players will jump at the chance. Fighters often have nothing to lose but their location in space. Players who are stinking rich might just take the job for fun. Once your enemy has been killed, he'll usually lose interest. He won't realize that he cost you $50,000. Most Pk'ers aren't very smart.
DISCLAIMER - I have nothing against roleplayed PK'ing or pirating. Just remember: don't ask for all the cargo, or your victim has nothing to lose. I really think there should be more of a penalty for death. (Granted, getting dumped back to Aniu Depot in a freighter with no guns and no escort is a pretty obnoxious penalty.)
Thinking about this is making me want to try pirating... *grin*
PS - guns help, bounties may or may not help, whining doesn't help