Well and I could definitely see pirating it to demo it, deciding it's not worth the money, but still finishing the game anyway. Maybe it's something I'd buy for $15 but they're charging $50.
That's another thing I took issue with in the video: they listed a bunch of flaws with a game that might make someone not buy it, and then said "but if you pirate it and play it, obviously it's worth playing despite the flaws." Their logic their is flawed. For one thing, there's a cost consideration that enters into it: sure, it may be worth playing if it's free, that doesn't mean it's worth paying money for, or paying more than a couple dollars for.
I pirate less than just about any PC gamer I know, so don't take this as justifying my own behavior, but I do subscribe to the philosophy that if I wasn't going to buy it anyway then I haven't hurt the developer by pirating it.