Sure, it could be a fun thing to do (I'd have done a little treasure hunt for $50, too), but the professor's syllabus doesn't say it's $50 at all. "Free to the first who claims" -- claims what? free what? It isn't even a complete sentence, in the middle of boilerplate that's if anything exceedingly verbose. It doesn't parse like meaningful instructions. That's why I think it's a hokey gotcha, and not an actual sign of "people don't read instructions" (which we all instinctively know anyway??)