I've been mining off and on for a while and I'm running 1.5gh/s across a few different cadaver rigs I've put together random parts.  Even with the spike in difficulty making it pretty much unprofitable, I can't even think of shutting them down.  The small amount minded could be worth a great deal at some point. On the other hand, money could be put directly into purchasing bitcoin if such a huge increase in value is to be assumed.  Just wondering if any other hobby miners have thoughts on the topic. I personally enjoy tinkering with miners, which is a advantage over a buy and hold strategy.