You say worth. People have different taste, so what would make a game worth it to you? do you mean hours spend vs potential moneymaking? or do you mean hours vs enjoyment.
The new WoW expansion is renowned as the best expansion in a looong time, so if you want to play to have fun, and experience the new lores, go ahead, that might be worth it for you.
As to financial situations, and moneymaking, i don't play it, and do not know.