I know we can block a person by right clicking on their message, but we could as well report people that are selling game currency for “real” money AND rendering the chat useless while doing so. Since you can notice they are selling silver for “real” money right away, there isn’t much to be analysed if you can see the message that generated the report. Dealing with these reports should straight forward.
Sometimes the chat is just spam, just a big noise on the screen, pretty ugly.
