Wierd that so many people aren't ready to pay to watch something, when LFR is so popular and that is pretty much a watch and almost do nothing experience most times compared to even flex, and heroic raiding without even saying. But those LFR people are still paying their monthly subscriptions to "watch" the LFR bosses die, but they still aren't interested in paying to actually watch nonbraindead versions of boss kills or pvp, or other skilled games.
Myself I see nothing bad in supporting a streamer or a tournament if you like the content they provide and you got the money.
Valve for example has done amazing job with the Tournament tickets in Dota2, where tournaments have HD streamers for free, but the ingame observing (with you able to control the camera on your own or look at the casters camera, and also able to choose to listen to the commentators inside the gameclient if you want) is behind ticket that you purchase in the dota/steam store to unlock the ingame viewing and replays for said tournament. It is a model that gives good quality streams for those that are satisfied enough with a good stream, but if you want to really study how for example a certain player plays you can do that in the game client to observe him for the whole match if you want.
And generally about e-sports a Quake match is awesome to watch if you got good a good commentator / analyst walking you through the thoughtprocess of why the players moving around the map in this direction / route and it is a shame that Quake is dieing because for me it is the best e-sport shooter there has ever been, but probably it is just way too hard for all the new generation of gamers so they just keep to their aimhelping CoD games on consoles, which has lead to Quake almost dissapearing completely out of e-sports (hopefully Reborn might bring the fast phase shooters back to their glory someday ^^)
But WoW is a different beast now, because they are trying to balance 2 things at the same time (PvP and Raiding) and it won't ever work out, so both of the scenes suffer. Still an entertaining streamer can still be worth money, because for myself it is nice to see people interact to their chats and questions. When comparing to even reality TV shows you can't feel as connected to these people because of no back and forth discussions.