For the first time I heard about the fact that you can earn on crypto-currencies, about three years ago. Mine started about three months after that. Long doubted.
 After all, this is now about the mining of information by a shaft on the Internet - every second knows about it, every third has tried, every fourth mine constantly. And when I started, there was no one to even discuss - is it real, is it profitable.

I myself worked in the ai-sphere as a manager, turned around this, but then nobody spoke about this specifically. I've heard about the edge of the ear about crypto-currencies, on the Internet I read and caught fire on the Internet. My friend and I decided to try. We invested in the equipment a small amount, which we were not sorry to lose, if that. At first they just wanted to see how things were going. And then rushed.

On the technical side of the question

My first farm was a small computer that still works. Then we expanded, and now we have a number of farms with my partner, I will not name the figure.

I invested about 400 dollars in my first farm. With this money we bought one video card, the simplest one. On it and collected a farm. It is not difficult to assemble a farm at home. About this already hundreds of videos filmed on YouTube, you can see for yourself.

For the farm, you need a certain number of video cards (suitable for video cards of conventional personal computers), power supply, motherboard and risers (adapters from the video card to the motherboard). Video cards need to be taken out of the computer with the help of adapters, so that they stand side by side. And we also need server power supplies - the farms consume a lot of energy, about 1 kW / h. Roughly speaking, like an iron or kettle. Only the iron and the kettle do not work for you 24/7, and the farm is turned on around the clock.

Although the cost of electricity pays off in full. They do not exceed 10% of the profit from the mining. How much I earn on mining is private information. But I can say that at the moment this is practically my main income. And with the current exchange rate, I'm ready to invest a few thousand dollars tomorrow in the development of my farm. But this is only if there is equipment - there is a deficit now, all colleagues rake off on the wave of growth of the bitcoin rate and the popularity of the topic of crypto-currency.

All my expenses are for equipment maintenance only. This is rent of premises in which farms are located, and electricity. In total, this amounts to 20-30% of the profit. That is, in general, mining is, of course, an advantageous thing.

In order to understand the order of the figures, we can assume that one video card worth $ 400 brings with a profit of $ 2 per day. That is for a month - 60 dollars. For 7 months, the investment fully pays off and begins to generate revenue. The total profit depends, naturally, on the capacities. It is possible and several hundred dollars a month to earn, and it is possible and thousands.