I'm not interested on the prize. But your conditions looks weird if a poster wants to win he will waits until someone posted the 12 posts. And one reply is allowed. In this case no one will reply you.
I think play only on the freerolls. You won't lose anything only your time but you have a big chance to win. Just search on the gambling section lots of freerolls there.
My suggestion is post this on marketplace. Or if you have enough budget and think you can you can still profit try advertising it on here on the forum. Bid on the auction created by theymos.
I think you are talking about ripple xrp. Try visiting ripple.com or ripple.com/forum.
Yes it is possible for a crypto currency without any mining just make it pure proof of stakes and premine it 100 percent. Means you virtually owns 100 percent of that coin and its your job to distribute it. I think it would not gain trust by many because it is not fair.
I found bitcoin in 2010 for when I was searching for paypal alternatives but did nothing to acquired it until march 2013. Because at the time I found bitcoin very few uses it.