So 7200-2400= 4800 cost so you pay off in about 1500 days at 10 cent power and in about 650 days with 5 cent power.
Electricity is more expensive than 10 cents in my country, and I guess the price is similar in asian countries. Probably there are some exceptions. 1500 days are too long to be honest. So if someone continues to mine, they probably do it out of their passion. Still, thousands of people are miners and continue to mine.
If I could move in a country where the electricity is cheaper than my country and has no restrictions on Mining, I would start mining
