I don't know if you are aware of this, but the email is heavily delayed regarding your 9.99 sales.

How badly is the delay?  Well I got mine 22 minutes AFTER the sale was finished.
At that point you may as well save the hassle and not send it at all.

Now I recall seeing the same issue last year as well.
For reference I am using Gmail though so you aren't being held up in a spam filter.

Since there is no site feedback / talk forum, I will have to leave this post here.