Here is the simple rule of life: If you see something that seem easy to make money, think again, why not everyone already jump on it ? If you can just set up a bot to collect resource for you, and let the cash flows in, what stop a similar kid like you in a 3rd-world country to do the same thing, for much less money ? Why you are different ? What separate you from the rest ?
This is an old industry, it already last for many years. Nowadays, I don't even think that it's profitable anymore, the risk is too high. Imagining you're trading drugs while the government sticks a camera recorder on your back, record every moves that you make, even when you go to the toilet. They have all the data they need to take you down whenever they want. You can pay the ransom fee to get out and start over again, but remember, you never be able to get out of their sight. They are monitoring you. Every single goddamn move.
That's why nowadays, only the big fish of the industry can be truly profit (they have the technology, the human resource to help them hide themselves, and increase their profit margin). The small fish just struggle for a living, think that they are making a small profit, until Blizzard hit them with the ban hammer. You are welcomed to try it yourself, but be warned: it's not as easy as you think it is. And be ready to pay a lot, for "learning from the mistakes". Good luck.