yeah its an ok idea, although i agree that there would be much better ways to require human input. how about a need for speed coin where every x amount of minutes there is a race in a game like need for speed and the winner of said race is reward with one block of coins.  that way you can't use child laborers (or at least if you do they will have fun!)  and you can accurately predict the generation curve.  You could make the tracks more and more difficult as more miners (ie racers) join the game.  

i think you mean Ripple. xrp is meant to be a currency, anyway. Ripple is the protocol. xrp are not IOUs, which you seem to be implying.

Full of miners, empty of users. That's way they don't have merely any value.
Am I wrong?

This a fun coin for history books. Solarcx tried taking 50% of the coins, but ended up getting 100% as he was the only one mining

The original threads are a good example that arrogance doesn't pay off.

Well, unless they change it, the original plan was it to not be minable.  There will be nodes that will work on consensus and verifying transactions but no PoW mining.