I am knew and I dont know if this has been suggested before, or determined if it is possible but what if the sale prices fluctuated based on supply and demand. That way there could be very high profit/time, but also you would keep traders moving around Sirius so that pirates would have more than enough opportunities. As people have stated that trading is mundane so if they have to constantly change where they are going it might add a lot of excitement. This could also somewhat limit power traders since they couldnt just do the same run while watching TV or reading a book.