However, there is another side of this that I’ve been afraid to talk about in public. And that is this: our studio has not yet seen a single dollar from sales. That Dragon, Cancer was created by a studio of eight, and for many of us it was a full-time effort that involved thousands of hours of work. This huge effort required taking on investment, and we decided to pay off all of our debt as soon as possible. But we underestimated how many people would be satisfied with only watching the game instead of playing it themselves.
And so yes, Let's Play person, I agree with you, it does suck to have someone else making revenue off your work.
Found this quite interesting as someone who follows game development and regularly watches Let's Players.