Update: I've added 2 more systems, and 5 more graphics cards for a total of 7 systems and 16 graphics cards. This has provided me with an estimated $1339 per month at this rate, and I'm now securing more hardware and moving into actual mining rigs so I can space out the graphics cards so they don't die in a few months :)
Disclaimer: This is something you should think on before you jump into, as the entry hardware cost is high and Ethereum pricing is volatile. It's not a guaranteed thing at all, and this is not a sponsored article. I used all of the hardware that I have lying around, and I'm doing this 'because I can'. I'm using around $10,000 worth of hardware (4 x separate PCs) but this could be done much cheaper, and is something I'll be going into in a future article.
This is just a tease, but I've been testing Ethereum out on my PCs and was instantly addicted. Any of you who know me personally or can see what kind of thing I'm into both personally and professionally, is that I'm addicted to hardware - especially graphics cards.