The point is that if one person getting them too often causes an imbalance, which I assert does, it should be changed. Otherwise, pirates will disappear from competitive play.
So the pirate system should change because you can't keep up the economy? If you get it each time it means either:
a) You haven't been developing your economy enough in comparison to the other player. This means that you've been outperformed, and you only got your own performace to play.

You've been spending your resources on a strong military. If you do this, then the pirates shouldn't bring enough to bother you. If you still can't match the pirate fleet, then you've been building up too slow.
Either way, you only got yourself to blame. The pirate mechanic works the same way for everyone else. If he managed to put the bounty on you, then obviously he is doing something better than you.
I'm not going to lose any sleep over the pirates disappearing for competetive play.