system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Where's my hovercar / jetpack? Iron Man is just around the corner. The Fantastic Four have a building in Manhattan. I suspect the SHIELD helicarrier is hiding underneath the Hudson. Why can't I buy a hoverboard for my morning commute?

Let's say I work in an office in Manhattan, NY.  I live in New Jersey, and I take a bridge or a tunnel in to work, which means my commute is terrible, but it's just too expensive to live in New York.  One wall of my cubicle is an exterior wall, so I'm lucky enough to have a window.  I've lost count of the number of times the Fantastic Four have zipped past in the Fantasticar.  Every time Iron Man flies past, the potted plants fall off the window sills.  Same goes for this Mach-1 guy.  The Wizard sometimes has this flying throne thing, or sometimes he's floating around on this translucent discs.  Don't get me started on all the supers with jetpacks or hoverboards or rocket boots.  It seems to me, personal flight devices are pretty common with the spandex crowd.  It's not like they're only toys for the rich and famous - some of these guys are nameless grunts (countless SHIELD operatives with jetpacks, and AIM flunkies), others are outright thieves and criminals.  What gives?  Where's my hovercar?  I would give an arm and a leg not to have to breathe in car fumes in the Lincoln Tunnel every morning and evening, not to mention the time I'd save.  I don't know how much the cost of jetpack fuel compares to gasoline, but I'm willing to consider it.  Why isn't someone selling flying cars or hoverbelts or rocket boards to the public?  I'd be the first in line.  
  
  
*edit:* In fact, why isn't Tony Stark selling them, specifically?  Seems like it would be right up his alley.
gpt
You know what else is common with the spandex crowd?  Money and resources, and lots of it.  Even your SHEILD operatives have lots of backing that the average Joe doesn't have.  
If you want a jetpack, they are out there for you to get.  They're just too expensive for retail production at a price point that makes them available to someone who can't afford New York rent.