I only joined ListNerds four days ago, I know many of the users there, and I have not sent a mail yet, sooo I cannot say what has happened, obviously it has not affect on my HP yet, although I have had a vote on a couple of comments from new authors, well new to me authors that I engaged with on their posts. So I tell a wee white lie, in theory my HP will grow ever so tinily once those rewards come in.