I have no idea what the deal is with management pilots, but I would think that they are necessary. From where I come from, they are a necessary evil, but necessary. Is $150,000 more than most A320 captains make in a year?
HUD's allow you guys to turn CAT I approaches into CAT II or III approaches, don't they? I know it's a huge additional cost, but when you guys are going places the competition can't go, there's a lot to be said for that. No CAT II or III equipment on the field...no problem. You Blue Dudes can cruise in there while other 121 operators can't even attempt the approach. Plus, once you've flown with a HUD, well...it's like crack for pilots.
I don't know about aux fuel tanks, but again, I would think that might open up tankering possibilities if fuel prices get out of hand again, and like they say, you can never have enough gas - unless you're on fire.
Of course, I could be way off base here, the HUD and aux fuel tanks, while difficult to justify in the short term, may have a huge effect on productivity and completion factor in the long run.
Of course, as an outsider, I could be talking completely out of my @$$, but I found it very interesting when I heard JetBlue was ordering those options on the E190.
Flame me if I deserve it.