I pretty much agree with all sides, here.
It shouldn't be possible for someone to have 10 NPC wingmen. That's OP, and it's OP that can easily be reached by paying extra cash money. That's not what we're here for. I don't want to have to know, factually, that I can't enter an area of space without being attacked by like 100 freaking ships being fielded by ten pirates.
I'm also somewhat against the idea of being able to hire an NPC crew to take your Orion out and start printing money with it. That seems . . . well, OP. I knew the Orion would make money, but I think you should at least have to interact with it for it to make money. Not just buy the ship and BAM--sudden income stream.
On the other hand, I feel like it should be allowed for hired NPCs to handle some of the day to day stuff. Say you're mining and want to load it up to send back to sell. A player that "only" has an Orion (and a hornet or something) could maybe radio in-system and hire a Hull to come out and load up and take back to sell. A player that owned his own Hull should be able to have NPCs bring it out for that purpose, and it'd be cheaper since he owned the ship and was only paying the crew. That's reasonable, and I don't see a problem with it. It would feel really annoying to have to hire complete outside help to deal with something that owned a ship for.
Similarly, I'm ok with people hiring a couple wingmen. Wingmen that owned Hornets would cost more than those who were running Auroras, but you could hire whichever you liked. If you owned a couple of Hornets, though, I think it's reasonable to have the cost of wingmen lessened because you're only paying for the talent, not the ship.
But yeah, there has to be a limit. It's not "realistic," no, but realism ends up with what amounts to unrestrained capitalism. Those with more money, even UEC, will have more ships and more wingmen. A good pilot can make up the difference between a crap ship and a great ship (just watch how many people in Auroras kill my Super Hornet in Arena Commander), but even a stunning pilot is going to lose against a couple people with 10 or 15 NPC hirelings each. And the people running those mini-NPC-fleets around are going to be able to make even MORE money, and get more ships. Hell, "realistically," you could hire 10 or 15 NPCs and have them go pirate for you.
Or hell, let's be simple. Tell your Orion to go mine, and eventually when it makes enough money to buy a second Orion, tell them BOTH to go mine. Time to third Orion is half what time to second Orion was. Then the fourth Orion would be quick as hell. There has to be a limit to how well this system works, or it makes little sense NOT to have hundreds of NPC-crewed Orions out there mining (and occasionally putting their profits towards even more Orions).