For me the ROI is really fast if u know how to cut down your hardware cost and  how to get your new Rx570 and 580 series  GPU @ official AMD cost price which is between $200-$220 which is pretty easy if u have a very good website like the one I always use for price alert update to get stores and website offering clearance sale and buy the GPU once in stock when u get the alert , anyway if u need the website alert to get your GPU, u can email ( leon.owen@protonmail.ch ) me for the link