I know we have posted about this a few times on PC Perspective and have discussed it on the PC Perspective Podcast as well, but if you are curious as to why the prices of AMD's latest generation of R9 graphics cards have skyrocketed, look no further than this enterprising consumer and his/her Dogecoin mining rig.  

What you are looking at are six MSI Gaming series R9 270 cards running through the aid of PCI Express to USB 3.0 riser cards.  

You can see the rest of the photos here and if you want to see more of this kind of abuse of graphics cards and you can also check out the Litecoin Mining subreddit where this was sourced.