It would draw the IRS's attention to all Americans working at EK and could have some very bad repercussions for your fellow American pilots.
TP, perhaps you should give the IRS more credit. I would guess they know all about US pilots working at places like EK because it's their job to know things like this and they're probably good at it.
It wouldn't help your cause, though, when fellow Americans like your very own
Captain America put themselves in
paid articles like this one:
He says pilots are "treated with respect in this part of the world. We're driven to work. We're put in four- and five-star hotels, on the concierge floors. Captains are treated as vice presidents of the organization."