Actually I usually demand 40-50 tons from T7s, but a T9 can drop 100 tons.
The decision how much he demands should be left to the pirate. If a pirate wants your entire cargo hold, then why not? It's still a lot cheaper than being destroyed along with your cargo. Limiting this would just lead to said pirates killing traders out of frustration.
40-50T from a T7 is about 20-25%, depending on the loadout. Little high maybe, but not unreasonable. Not sure what a T9 can carry as I've never owned one.
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Of course it should be up to the player who is playing as a pirate to decide what to ask for, and right now it stinks that you have an artifical 20T limit. But a pirate should be aware that the greater the % of cargo he is demanding, the greater the chance he will be told to swivel. As people keep on moaning, it's not that hard for a dedicated trader to make the money back. Traders are in the exact same boat. Too many pirates asking for too much and the traders are just saying "No, increase your bounty. At least that'll feed some of the BHs out there." and then they're either moving to a different set of systems, or they're going solo out of frustration. Either way impacts your enjoyment of the game, but why should you enjoying the game have a negative effect on my enjoyment of the game?
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True, I don't have the first clue as to how much it costs pirates in repair bills yanking other ships out of SC, paying off fines [and previously bounties too]. But don't forget, when you are levelling 'massive profits' accusations against traders that the traders can be paying as much as 9K/T and many are hoping to get 1K/T profit on that Where as pirates don't have the inital cargo outlay and can sell at 9K/T and get probably around 8K/T profit [especially if the trader submits and gives cargo]. A lot of the time, traders can't even escape as pirates are generally in bigger ships and mass lock things up to an Asp. And again, I get the whole 'Rare' trading means traders don't have such outlay and the profits are huge, but that's why they are more likely to be targetted by pirates. Pirates seem to have gotten the same misapprehension that surrounds shopkeepers in the real world. People don't just hand us this stuff and say "Go make some money", we have to pay for it first. And any shopkeeper worthy of the name, knows that business involves some 'shrinkage'. That doesn't mean that they just sigh, say "Oh well, it's part of life, I suppose." and carry on regardless. They want to do as everyone does. Maximise their pleasure, and minimise their pain.
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I don't like playing solo myself, kind of makes the whole 'online, persistent universe' thing a bit pointless, if you ask me. But traders are getting hit by NPC pirates, and player pirates. There is no way to limit the damage to the traders as we can be hit by an NPC, then a player, then another player, ad nausium. I give you 20T, then the next guy takes 20T of what's left, and so on. How long is it before I'm making a loss? And how many traders do you see continuing when that is a factor?
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I wonder how the playerbase is devided? What is the percentage of players that are explorers? What percentage bounty hunters? What percentage miners? (Bet that's a low one!) What percentage are traders, and what percentage are pirates? I bet the percentages are off. I bet that there aren't enough full time traders to keep a decent supply up for the pirates. Even I'm not a full time trader, and I'm working my way up past the rankings quite quickly. But trading is boring. Anyone can slap some cargo racks on a ship and move "Biowaste" from one place to another. At least when I'm out of the bubble I can see some of the most wonderful sights in the game. And excessive pirate activity is one of the things that generally keeps me out there [because there is none out there. Even IF I saw a pirate that far out, I don't have cargo to take, so why would you bother me?
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Sorry, bit of a 'stream of consciousness there. Didn't meant it to come out as a rant, because I am basically on your side in this. As I have suggested, capping at a percentage - providing the percentage was set correctly - would give traders a bit more confidence that they wouldn't lose it all in one trip [although the risk that they'd drop cargo and then still get destroyed is still there.] whilst allowing pirates to make a decent stab at improving their lot in the game. maybe keep the 20T max around stations, but there should be no need in deep space.