Why does everybody think the Blake algo is being instamined?
A single r9 290 will mine at more than 2.5 times the current network hashrate for Blake if that 1.2Gh figure is accurate.
Its an estimation. And how do you know the hasrate of 290 on sfr-version of blake? Please share the GPU miner with us

At this difficulty wallet-mining is pointless unless one has botnet running the wallet... Even then, mining cryptonight will be order of magnitude more profitable.