They don't have the money. The WOW TBC Gold reason is not because they cannot afford it. It's now a cash grab game that involves more food and handshaking.
SOM will be suffering the same fate as classical due to insignificant changes. The "first step" does not meet their standards. There are so many minor changes that take minutes to implement that can result in large-scale changes and create the cheap Burning Crusade Classic Gold experience unique. Simply said, blizzard has lost all feeling of ambition. Therefore, the OP message of discontent was made.