If you're in a 5,000 supertransport odds are you're working for a corporation.
That means the ship you're in and cargo you're hauling isn't actually yours. Nor is whatever profits the cargo brings. You get your wage of a few thousand credits and that's it.
Case in point: My Gateway Shetland runs into a group of Rogues. They demand 2 million credits (lol). I rant on about how I'll never see that much money in my life, what makes you think I have access to that sort of money and so on.
I leave minus a few hundred thou' worth of Boron because I literally threw it in their faces.
As a corporate employee I don't give a rats arse about the cargo - IC will reimburse the company for it anyway. So dump enough cargo to fill up all the ships present and provided they aren't retards you'll probably be let go.