Thanks everyone for reply every post is eye opening, for me electricity is included in rent so not the problem, but for simple calculation 60GH will mine from 650$ to 500$ monthly and I can have this from second hand like even today, but as most of You say, its not a good idea.
What I think is, now price of BTC is high, when those ASIC companies will start to sell they equipment, they will also starts to sell BTC and the price can drop, only after some time when they gonna sold some BTC and when Difficulty Factor will be high as hell, price of BTC can jump to sky, because of lack of miners. Think... now who have 300GH is making money, in 3 months most of those miners will have 3TH, so what about those people with 1-2GH? They will be like 337MH right now.
Somebody agree with those thoughts?