[Merem]

While there are currently no professional players, as amateurs, the top guys definitely earn more than what you would get as a professional SC2 player. In July 2016, the 10th highest earned $7,699.18 USD, the highest $36,811.18 USD. And those numbers don't include ad revenue, tournament winnings or sponsorship deals.

[ajsalminen]

Earning through streaming can be detrimental to the level of play though. At least one of those top10 doesn't even bother playing competitive matches and I'm pretty sure he's not the only one that's not really a competitor even if he's making a living as an entertainer playing Starcraft.