Keep merchants at the station, in rotation.

[Frank_Stein]

The question is, if the merchants never leave the station, how would you get to centcom early?

If we're the on station merchants, the random ones could arrive on shuttle, meet in the bar, run some stops, and then head back to the shuttle where they board and depart the same shuttle their replacement arrives on. 

Or you have on shuttle guys, and then some people that continue to arrive and stay on their merchant shuttles.

Or maybe each shuttle arrival brings new merchants that leave the same way