I've been getting PMs for my trades, but a lot of the times I Just miss the guy by a little bit of time. I'll send him one after, and he's afk. It will go back and forth like that.
Maybe if there was an alert when you got a PM (a beep or something), we could respond to PMs more efficiently.
It's kind of like some types of e-mail. "you've got mail." This time...."You've got PMs" (Although, I guess it could also say "you've got mail. :D)
What do you guys think?