Big money compared to who? Any top Dota2/LoL/Overatch streamer shits on ANY and EVERY WoW streamer by quite a big margin. Throw in the sponsors who flock to those games/streamers/brand its not even remotely close.
Even the "big" wow streamers have had to venture into other games because they realized WoW has zero future money wise. What the top WoW streamer left is Toweliee? Who doesn't hold a candle views wise to at least 10 LoL/CsGo streamers not even including the Dota2 ones. Nobody can watch world 1st race because of the strats and nobody watches the garbo wow arena tournaments so what money is there outside of donations? You have to be providing something other than your "top" guild to get donations aka be likable/personality/funny/entertaining.