We can stop "gold farming" via modules for real world cash sales with one simple "mechanic" - because they are bolted to the ships hull rather than stored in the (presumably mechanised) cargo racks, modules in transit cannot be ejected, thus could not be "transferred", read sold,
The previous sentence is confusing, but Dragoniv's idea about non ejectable modules in transit is such an obvious solution to
@Robert Maynard's "problem" with players hauling modules as cargo, that I am genuinely surprised the highly esteemed Mr.Maynard didn't think of it himself. Its such an obvious solution to that issue that its been brought up a few times within this thread.