After Pro-League closed down and all the Korean sponsors pulled out of SC2 (except for Jin Air), many Korean pro SC2 players aren't getting a salary. Also, I assume many foreign SC2 players may not be making a salary either. So these online tournaments are a good way for pro and semi-pro players to make some money to sustain themselves. Unless you're one of the top SC2 players (ie. Maru, Innovation, Rogue, etc), you probably don't make that much money.
Many tournament organizers lose money and are doing this for their pure love of SC2. So let's show our appreciation for the online tournament organizers for helping to sustain the SC2 scene!