My opinion here that this is a bit bad idea. Let peolpe build POB's not inside of mining field, but 1k outside of it.
And pirates that saying that you need more piracy: you have transports too. And when you got pirated you bringing your attack wings. My friend pirated alot, and after his piracy he's bomber "Stinky" was attaked by Cruisers, fighters, gunboats and ones by Bretonian Battleship that came close and just shot him without even saying anything.
Pirates can pirate good if you not stupid. I'm pirating sometimes and i'm having fun with it. Yes sometimes "victim" flyes to POB's or any other NPC bases, so what's a big deal? When you got pirated you become angry. Others can really leave the server only because of that. I saw 1 player who wanted to leave because he couldn't make much cash for bigger ship because he always was pirated and he was just a Camera ship. I personaly gaved him cash for bigger ship so he could play.
And about interaction when you supplying your base: i agree with that. I made alot of pirate friends while supplyed my base.
I don't like if POB's will be moved so far out from mining fields. I'm miner myself sometimes. I like to fill POB's with ore so everyone could come and buy it and not wait for miner. I'm just against that POB's are inside of fields. Move it 1k outside so my mining turrets won't hit base and it wouldn't shoot me.