Time to abandon Bitcoin full stop unless your rich, a banker invested business or funded by mummy and daddy. (joking) entire rigs have been wiped out in hours, value is dropping, why bother? the only hope is that they are worth a huge amount in 5 years or so because people are not going to be attracted by this lunacy, only deterred.
Ebay will be flooded with CHEAP 79x 78x etc video cards soon!! win win for gamers haha...
must admit, i did see this as a way to get a nice gaming/rendering rig without the missus complaining, just showed her some cash generated from Bitcoin and she was happy!