I am gonna go out on a limb to get some hate here. But, without hate its harder to see the love, so...
But just to be clear, I am just expressing what I think is partly to blame for the issue with fewer succesful NFUs than FUs.
Its not meant to point finger or otherwise criticize the community or its rules.
Here goes:
I dont think the issue lies with how the NFUs are written but rather how the FUs are written.
FUs dont RP the setback with being force sensitive.
Light the light side cant attach itself to power since it inevitably corrupts. A jedi given a million will slowly turn and try to use it fir the greater good but keeps ignoring that this puts the jedi in a power position where influence and wealth eventually makes for taking things in their own hands. A road that even the greatest heroes in the movies (like Anakin and Dooku) cant resist to fall for.
Instead we are applying a superhero, a la marvel, to our heroes and goes off with super powers without the drawback the force could be tole played to have.
The dark side is of course all about gaining power but it is that in such a grave extent that it eventually consumes the dark sider and he/she is turned into something else, a monster that is so corrupt, selfish, hateful and also paranoid about loosing the power that it eventually leads to murdering even those close to one self.
Sidious kept a close eye on every force user to be able to stay in power over such a long time. Other attempts to cooperate should work for a while but as soon as things are flowing they turn on each other.
Instead we RP our dark siders as if the can control these feelings and choose who are exceptions to the rule, which makes things easier of course since its logical to cooperate. Its just that the dark side is perhaps not so much about logic.
And then in the middle sll the neutral can just shrug at it all and say that its not the force, its your own actions that defines you, in true christian spirit which also is a very practical approach on things.
What I am aiming for is that if above were not true, that light siders had to stay away from power in order to avoid corruption and if dark siders spent more energy on destroying each other the NFUs would end up in roles that FUs simply cant fill on their own because of above.
Again, this is just an analyze - everyone are free to RP whatever! I am not saying otherwise, just giving a thought on this particular problem.
Just my five cents on why NFUs are less frequent as high ups for longer period of times.