However, as the concept of adding new rigs, at this point I just prefer to buy coins
A much wiser decisions to be made rather than buying miners as of todays. Profitability would only be suited out for those who already reach their roi. Electricity does still matter if you profit out to pay up the expense then i would simply stop mining.
Nice try Vitalik .....
No, he wont post up on a Bitcoin Forum. haha