I honestly quite enjoy the idea of an LPI faction purely focusing on nothing but credits and profit but at the same time I feel that asking people for money before intercepting them (hostiles) is not the right way to play it out. Seeing as this is a Police faction though, honestly that might just be fine. Leave the people that are only in If to provoke fights for the military, they should be the ones dealing with actual threats and not the Police. The only concern I have in that regard are the awkward encounters people will be having ingame, a lawful straight up refusing to engage into combat unless paid by their enemies will probably result in very iffy and awkward situations.
Then again, asking for "donations" from people that ask for your service is completely fine and I think it fits the description and the goal of the faction.
Good Luck