Aircraft Sales 101
Typically the corporate pilot is the one that hunts down the upgrade from a turboprop. The exception being the rare bird owner that calls up the factory and just orders one up.
The problem with your typical corporate pilot is that he doesn't have the skill set to deal with run out engines, paint, interior, radio upgrades, or bringing a foreign registered aircraft on line. It's the same mentality of why your typical corporate pilot isn't putting a 10,000 hour right seater in his plane...or why airlines hire robots, they want a situation they have some control over, they keep things in their league so to speak.
That said, you would think it would be simple...but a foreign aircraft has to have it's log books and maint records checked, then of course how many guys are booking flights from California to Germany to look at a plane who''s logs have to be translated from Russian.
Typically sales brokers will hammer down a client with a plane off shore to make it worth investing and bringing it back. They have the experience, but also some rich guy's investment money behind them, so they don't have to worry about it.
So yeah, the work around is N registered, but even then, when someone wants to check out the plane, you have to tell them it's in Angola...now what?
So if you want to sell a plane, chances are you bring it to the US for the dog and pony show in front of some broker's office or just fly the plane until the right guy willing to fly over(because he's getting the plane cheap) comes over.