I just wanna pitch in my two cents again, players on DR tend to be, upper class. They can often be seen rocking unusuals, stranges, vintages, and fully decked out characters, and often carry keys/metal. It is quite easy to get a good trade done on DR, since people often like to show off, but since time between rounds can take a while, it's always nice to take advantage of it and get a trade done if someone is interested in an item and has the materials to do it.
Unlike the trading server, where people are either trading low value items that people don't want/need, or such high value items that no one wants to buy.