As well as adding some convenience, ET might save some bandwidth charges if there was a Last Page link next to thread titles so a reader could just go to the latest posts that they haven't read yet.
There is. You see how it says last page on the right hand side. http://www.elitetrader.com/vb/showthread.php?threadid=64965 Also on this page, those grey arrows next to each name take you to the last page. http://www.elitetrader.com/vb/forumdisplay.php?forumid=29