It depends on the person. A lot of people do the opposite. After all, they could just go play the game themselves, why would they watch someone else play?
Wit, personality, and insight can count for a lot in a Let's Play. It all depends on what you're looking for.
Sorry, though, ValorsWolf, I have a lot going on and I haven't had a chance to watch yet. But I'll get back to you a bit later.