dude, you're complaining about getting above lvl 50? current version of the game gives enough power to 65 (btw, 1 billion exp is needed for lvl 66, i'm there atm). An expansion now wouldn't make a difference at your level, you wouldn't be able to equip/use the new stuff. It's meant to take a long time to get the "epic" level, took me 7 months for 65.
Yeah, it's taking long, but no use complaining, they're working on it, they can't just swing their magical GM rod and make the expansion appear, it takes a lot of time and testing.
And your sum in the other post is wrong, less than half of the players buy plats, they get much less money than you think.