So Right now I've got; 5 Hyper Freighters, 3 Templar Cutters, 2 Inquisition Cruisers and 1 Omega Cruiser. Pretty much all with full upgrades.
I can Spy for weeks make a hundred K a run with 250 hold. Take out a few contracts Cross the quadrant with low fuel economy then pick up either a Templar Cutter too Gun Bunny capture/destroy missions into submission a Cruiser to do the Blockade missions or keep the Freighter again and Complete Serveilence
Get repairs, Check all the upgrades n New ships an such listen to the Rumors and hope for a Metal surplus
you see I've found a way make over a mil from one
Did you ever notice that when you end a trade surplus, as long as you don't leave the planet, the price will still stay the same?. Well you can roll up in a Hyper Freighter that has the water fuel tanks, + 20% hold with up to 225 metals inside and just park it in the Star Dock.
Purchase a cheap ship for like 200k nothing flash just make sure it has good Solar Sails. Hop on over to your Closest Hyper Freighter pick that up and sell your Cheap ship.
If like me you have good Caches all over the place, you shouldn't have to fly more than 24au to the relevant wild planet pick up a further 225 Metals and hop back on over to the Shortage before it's over.
Sell the goods from your hold. And as you leave the exchange, be careful not to leave the planet. Switch Freighters at the Star dock and Voila. 450 units sold in one shortage.
Using this method it becomes possible to make over 2mil in credits, pure profits after expenses from a single Metals Shortage.