Are these things being issued as homework by lazy teachers? Or is some company using them as part of an interview process?
There's a steady stream of people wanting to have these done for them; if they were doing them for fun, they'd be doing it themselves, so what's the source of people wanting it done for them?
If I had known that you can complete "challenges" for rewards when I was first learning, this would have been great. However boring they sound now though..