Because of the limited scope and limited demand niche coins are not used to stay afloat for a long time. Perhaps you want to take a look at the NXT monetary system. That's something designed for making such coins on the top of the NXT blockchain.
Maybe I am alone but I have never even heard of voin before...
No, you are not alone. Actually when I asked Google, the best hit was this topic, so if it exist then it doesn't seems to be something serious.