Because preparing a negative income system to prevent your competitors from hurting your economy with a weaponized expansion is bad, mmmkay?
How many times has that happened in the history of powerplay? How many times has bad systems been prepped for other reasons? I know for the power I work within we've planned to prep 2 negative income systems in 40 weeks of PP. On the other side, at least 2 per week that are negative get 40k+ of nominations. If it is a gradual build / decay of rep and you occassionally do something on a micro level that is bad but on a macro level makes sense then the net impact is going to be the 5C's have reduced impact and the people working for the good of the power will get an increased impact, mmmkay?
And preparing a positive income system that is so far away that it will get undermined but never fortified is good, mmmkay? You cannot automate the differentiation between what makes a good or a bad system, because there can be a multitude of reasons behind preparing and expanding a loss making system, just like there can be a multitude of reasons not to expand into a profit making system.
I'm not trying to make it perfect, I'm trying to eliminate the total dross expansions I see week after week after week. I fail to see how this is counter productive, at worst in moves the sabotage attempts from bad -ive systems to bad +ive systems which will be the first to go when not fortified and undermined, so will act as the 'canary' lost systems saving the other valuable assets of a PP faction which would be much worse to lose.
Want to get rid of sabotage preps? Remove the fast track preparation PowerPlay goods. This would move preparations to being nominations only, and this means that the only way sabotage systems make it through is because there are enough saboteurs in the power that they represent a significant portion of the player base. If preparations are nomination only, it is still possible to do weaponized preparations and it is still possible to prepare loss making systems for whatever reason, provided that there is enough support for it within the power. It would move the control of preparations out of the hands of a handful of extremely wealthy ne'er-do-wells and into the hands of the organized groups.
I like that idea for significantly reducing the risk of sabotage preps, but it doesn't do anything about the impact of 5Cs people stocking up on fortification materials and then discarding them to their friends to undermine from within. Is there a way to limit the sabotage undermining along side the sabotage preps, as this appears to be as big an issue as the prep one (albeit the prep one is longer-term impact and the undermining one is felt more in the specific week).
If you think this can be automated, then you've not spent more than 30 seconds thinking of how this would be counter productive.
Sad as I am, I've thought about it a lot, and also think it kinda works from a RP perspective too. The antics of the commander that keeps losing their cargo, will become a figure of fun, so won't hurt the overall faction. If people support giving up a system, even with the best intentions, then its going to hurt their rep marginally for a bit (the general population don't see the bigger picture, they just see their 'heros' standing by while a system slips out of control). It could also make for some interesting gameplay - taking cargo from the 'face' of a faction would be far more harmful to that faction, so might help spice up the action a little?
I think there are lots of individual scenarios and specifics that a system such as this wouldn't solve, but I think in the longer-term and over multiple weeks it will benefit those advancing the cause of a faction and limit the influence of those sabotaging from within. Is it perfect, no; is it something that seems relatively easy to implement and staying true to the 'flavour' of 2.1 planned with the idea of reps for mechanics and an overhaul of missions / standing with minor reps then, respectfully, yes.