I tried to search but couldn't find the information I was seeking...
I built my depot inside the side of a mountain. The entrance is 3 doors wide (using the wall-removal method to get the central door) and they are controlled by levers and open unless I am drowning elves.
What I am wondering is 3 parts:
First, when traders come I still get the "They have bypassed your inaccessible depot" message, even though it apparently is accessible as they still arrive and unload eventually. What's going on there? Are some of the wagons in the caravan turning back? Which leads into my second question:
Second, Trade goods have gotten less and crappier, by a lot, recently. I'm 14 years in with 190 dwarves. I've never killed any traders but elves (via drowning), however all caravans shipments have gotten smaller, in fact the elves are the ones still bringing the most, unfortunately just a bunch of crappy cloth. Could killing the elves be angering the other traders? Why are they bringing less stuff? Which leads into my third question:
And Third, Could it be that I'm selecting goods wrong in the trade agreement screen? I tediously go through and set everything I want to 100% and leave everything I don't want at 0. They usually bring a couple of the things I asked for not everything by a long shot, in fact I'd say something like 1/10 of what I ask for or less. Is there a better way to weight the selections in the Trade Agreement process?
1) I'm not sure what would be causing this, but the doors stand out as a possible cause. Check depot accessability like kurisukun said, and I'd bet that the green stops at those door. If so, try removing them and see what happens.
2 and 3) Killing elves won't affect the human and dwarf traders one way or the other.
The traders only have a certain amount of space, and the more of your requested stuff they bring, the less space there is for other things. If you're asking for lots of stuff (especially really heavy stuff like anvils or ore/coal), you're
very likely to get only one or two bits of the stuff you ask for. If you ask for a TON of things, there simply won't be enough space for all of it. I'd suggest deciding on figuring out what you
really need and ask for that, and leave out anything you can get by without. Also, you'll still get stuff that you set the slider just one notch over on, so you don't need to crank it to 100 unless you absolutely, positively need every little bit of that good that you can get your hands on.