I have explained both particularly in May when I started suggesting 2500 or so as a new target (<a href='read_msg.asp?message_id=3070269'>#msg-3070269</a>, and <a href='read_msg.asp?message_id=3285716'>#msg-3285716</a> for more or less technical reasons and fundamental reasons in the likes of <a href='read_msg.asp?message_id=3318702'>#msg-3318702</a>.