The Trader is an interesting specialization, with a focus on making money and spending it in unorthodox ways. Traders are characters with plenty of deals going on behind the scenes. They are generally involved in more business ventures than a gunslinger has blasters. They get a steady and significant revenue stream, and then have ways to spend that money to make their lives a lot easier. This might include knowing who to bribe to get some crucial information, or just spending a few credits to take their mind off their current troubles. And of course, few characters are going to be more useful than the Traders when sitting down at the negotiating table.
I'm ready to be corrected, FFG.
"Let's criticize something we have literally next to no information about!"