- he doesn't understand torrenting and so is helpless against it
- he cares about his viewers more than taking advice about DRM
- the video is owned solely by him and not some soulless corporation, and you're directly hurting him by torrenting
- you'll destroy his faith in mankind if you torrent
- five dollars is nothing compared to all that!
All of which combines to make you feel like a huge asshole for even considering pirate bay - in the nicest possible way. This type of thing makes a lot more sense than DRM in his case, and I bet it's a lot more effective too.