This is one of the arguments I never understood. If an enemy invasion fleet is above the planet, the last thing a credit loving smuggler is going to do is try to fight the fleet. At best he will just run the blockade and jet away to some other underworld hub.
This made me lol I can just imagine the smugglers and BH's saying "**** this ****!" and getting outta there. I would imagine things would be different, if it weren't a sith fleet though or if tech wasn't the same, then the smugglers/bhs and the like might do something.
You can't spend your credits if you're dead.