> Even if it only earns them a few dollars a day, the opportunity cost could very well be zero. You forgot the opportunity cost of the datacenter itself. It wo

> Even if it only earns them a few dollars a day, the opportunity cost could very well be zero. You forgot the opportunity cost of the datacenter itself. It would be much more profitable to turn that into a colo or a VPS host with some new hardware. Regardless, once the bitcoin reward goes low enough Bitcoin will probably become worthless. It's already not usable as a currency, and without the distributed ponzi system ofhanding out blocks to miners, what motive will anyone have to buy it?