Just because a game is competitive and popular doesn't mean that it makes a good esport. Look at massively multiplayer online role-playing games. MMORPGs thrive on multiplayer -- it's right there in the name -- and financially, they're a multibillion-dollar industry. Yet as far as esports are concerned, MMORPGs are little more than a footnote. They might be fun to play, but they're not always fun to watch. That's a problem. After all, an esport lives and dies by its viewers. According to a  study published by SuperData Research, about 80 percent of esports earnings come from advertisements, sponsorships and ticket sales. If a game doesn't appeal to spectators, the audience will tune out. If nobody is watching, nobody gets paid. MMORPGs' lack of esports success doesn't come from a lack of trying. Take World of Warcraft, for example. Blizzard Entertainment has a great record with esports -- it publishes StarCraft II, Hearthstone, and Heroes of the Storm -- but its...