[miles]

The article says their electricity bill is $60k per month. Subtract the 3 employees salaries, say $5k per month (this is China). So you are looking at a pure profit of $197k per month.

Three other significant expenses worth considering: rent/physical plant, hardware, and taxes.

[contingencies]

In most cases in mainland China, no tax is paid and cash is king. Only if you are a large, visible company doing business with other large, visible companies do you need to get formalistic. Even then, double or triple sets of accounts are normal.

[seanmcdirmid]

I pay plenty of taxes. Heck, I pay the tax on my rent for a fapiao that gives me a tax benefit at work. The PRC is getting better about tax collection, though a lot of activity still goes on underground, especially those that are related to money laundering.