I'm sure there's GPU miner, but he was not to make a public! First, rich owner of a miner, and then maybe make it available. I see how coins are fused.

Sure there is somebody mining with a gpu, look at Suprnova, the first guy is mining at 50kH/S +. (400 i7 8 cores cpus or more...)
I'm mining with 70+ cores and i get 1,4kH/s, this is unfair

A gpu miner wouldn't give you such an advantage, It's been mentioned before that a gpu miner isn't that much more efficient than cpu.
It's most likely just someone with a lot of pc's it can be a botnet or a school, who knows.