Hum... rather mixed on this one.
On the one hand, I LOVE the idea of hacking or raiding more goodies. I too wish there was a chance you could clean em out in one shot. Hhahahah

Of course, that should come with the necessary counter risks (like losing FIVE crew on a failed overload raid, or giving up the location of THREE of your planets for a failed overload hack). I most certainly think it would crank up the pvp as someone has already mentioned. If you hack for a larger amount, be prepared to get zeroed.
I will also give you a plus 1/2 for the "perfect hack" idea. It would add a fun element to the game if you could keep improving your hacking ability to the point where you could steal some and get away with it.
One last note, as weird as it may sound, I never get badged back much for my hacks either. Now part of that is because I don't look like your typical hacking punching bag. I had insane rep like most fighters around rank 40 or so. And I don't understand why so many hackers neglect their hull and defense. I won't lie to you. It takes a long, long time. I have been playing well over a year. But, it is possible to make an armored hacker.