I'd like to comment that the Jupiter Guild attempted to run things all neutral. They are all gone now, and I don't really remember them ever actually completing any contracts. By staying neutral, you can only kill generic ID'd players, and not even the more notorious of those... meaning that you actually shoot yourself in the foot even harder than if you pick a side. This isn't 2007, the vast majority of players have NPC faction IDs, not generics.
Picking a side is necessary. You need someone to take contracts against, and "generic ID'd players" is not a good enough target (especially since most of those contracts are absurdly narrow). Especially now that every house is at war with someone, it simply isn't feasible to try and please them all. The BHG| couldn't get Magma Hammers at one point because despite doing dozens of jobs for Liberty, they also worked for Rheinland. And that war is like gentlemanly fencing compared to the Bret-Kusari war... you work for Bretonia, even not against the KNF, and Kusari will bounty the hell out of you. (Even the BHG| almost got into some serious shooting matches with the [KNF] because of their Bretonian contracts.)
This is not 2007, nor is it 4.83. You cannot be friends with everyone. The Zoners are getting into cap fights on occasion. The BHG has had struggles to keep face with Kusari, and Gallia considers them villainous swine for even talking to Council. It is a time of choosing sides, of drawing a line in the sand and saying "this is who we stand with, for better or worse". Every choice has consequences, and not everyone will come out okay. If you do not choose your enemies, they will be chosen for you.