I guess they had lot of subscribers until recently, and business was blooming, so decided might be good idea to rise the rates further. But don't worry, they have to come up with all necessary adjustments in their pricing plan soon
Rokafella Checkout this thread as well:- http://www.elitetrader.com/vb/showthread.php?s=&threadid=52748&perpage=6&pagenumber=3 for the ins and outs of actually running TS 8.