How to deal with Quicksellers's unwanted PMs about LiveCoin:
1. Click the "Report to Admin" link in the bottom right hand corner of the message.
2. Type "Mass PM spamming" in the text field.
3. Click "Report Message" button.
Additionally, you can block all future PMs from Quickseller by clicking on "Profile," "Personal Message Options," and adding Quickseller to your Ignorelist. Then click "Change Profile."
Yeah, I did receive a message from him, seems like he is sending it to all campaign participants, for now I just ignored it, but thanks for your suggestion.