Here is a description of 'X-3' or as HSX Players refer to it as 'ARB':
http://www.hsxdude.com/7/post/2010/03/hsx-free-money-report-1.html
To answer the second part of your question about the stocks being ARB and still droping in value:
1) HSX Players are all at different skill levels and while you see it as a good investment to hold the stock one way for future profits... other players might just see that the stock has leveled off, hasnt been moving much, hasnt made them much profit and is tying up money they could be investing elsewhere... so they are cashing out causing the price to drop.
2) Many players do not pay attention to the TV Industry or to my weekly reports.
3) Summer movies are coming up and they are very expensive so many smaller ports clear out lots of their stocks (see #1 above) so they can afford the high priced summer stocks
I hope this helps you
RazorHawk