I'm not a trader. Sure there's money in it, but the idea just doesn't appeal to me. On the occasions when I do trade, I strongly prefer to add value; station trading is anathema to me, but making a little isk stocking my building system is fine.
There are times, though, when it has to be done. When you can make actual isk on a sure thing with no effort.
What's that? People are selling naglfar for mineral price?