Yeah, a i5-6600k is a bit over $200 right now, and Ryzen is just around the corner. If a TB3 enclosure was, say, $100 (then you'd add an appropriate ATX PSU) and there were reliable, tested cables (and OSX drivers), I'd be all over this. EGPU has been around for a few years now and has yet to take off. Hopefully TB3 will remedy this, but I'm not holding my breath. I think a lot of the blame is on Intel, and hopefully with TB3 now they'll fully support eGPU.