As long as the GPU miner doesn't come out publicly within 7 days I should break even on what I paid for these (but probably not recover the cost of my time spent on them lol). Also, I have all the old cases and parts, I could sell these as 'faulty / for parts' without PSUs on eBay for more than I paid. That being said, racing out and buying a rack full of new servers would be a bad idea, if you can't use them for anything else.