Do we know how long he has been streaming? Assuming that image is accurate and he has been streaming 300 times/2 times per week, then that's been around 2.88 years by my calculations. It's not Pewdiepie money. But 108k isn't poverty line money either. 108k, in a span of 3 years, as a side gig for basically just turning a camera in front of his face, and rambling for an hour or two, is extremely good.
He ain't rich, but this just proves to me that, just like I suspected, he is a professional e-begger. There was zero reason he couldn't have paid his taxes himself. And he isn't going to die of starvation by just waiting a few days for Patreon to pay him. He pretends to be poorer than he really is. Pretty standard from YouTubers, to be fair. But his earnings, including youtube ads and patreon, are more than enough for basic needs, and still have a profit for leisure.
I think ultimately this is what makes Linkara's work dreadfully boring. Remove all the unintentionally funny, or perverted things like the green M&M or his rape obssesion, and everything he writes, be it his comics or fanfics, is ultimaite about how awesome he deludes himself to think because he is incredibly uninteresting.
Without Doug, he would be a dime a dozen weirdo posting self inser fanfics and terrible drawings on deviantart.