?

Obviously, everything DarjeloSalas​ said is true.  It's just not financially a good idea for them.   

One idea however, we could possibly have 'special events' where a couple of times a year we get the same rewards for all raids.  Personally, I'd absolutely love to see if I could solo the tank or sith raids now.  However, I just don't have the opportunity to try.  I even tried joining guilds about 6 months ago to do this, but that's an absolute nightmare.