I'm talking about Bitcoin in particular, but really all the proof-of-work cryptocurriences are jacking up GPU prices. Bitcoin, however, was designed with arbritary restrictions from the start (such as max memory usage) and now they can't pass any upgrades to alleviate that because the miners refuse to incorporate those necessary updates.
And all of these alt coins are no good either as they just create multiple thin markets. If you have one singular currency it can become big enough that massive jumps up and down are extremely difficult to pull off and take a long time to move, but a smaller altcoin all you need to do is mine a few, convince a few people to buy in, then sell all your stock leaving those dupes holding the bag while you run off with millions.