It also makes perfect sense. Take Firefly as an example:

Mal and Zoe are Solders who have, by necessity turned to smuggling

Jayne is a Hired Gun who will do anything to get by (possibly even turning in River and Simon)

Wash is a Pilot who would do anything to protect his wife

Kaylee is an Tech who when push comes to shove WILL put her life on the line to save her ship or a crew member (though she would be far from effective)

Leaving Book, Inara, Simon and River out of it as they are not technically the "Crew"

However if the ship is caught with illicit goods on board by the Alliance, they would all be charged with smuggling as they would be at a minimum an accomplice,

In one of my games, there was a Smuggler/Pilot that had never smuggled in his life, and a Performer who did public speeches

I think every PC in my first game worked as hired guns even though only one of them had that career.