Man...so much negative energy on this post! OP...how soon will you be able to get your rig up and running? If you are fine with not getting immediate returns, then I will highly recommend building your rig and start mining and hold on to mined coins.
Let me share my experience from 2014, I mined Monero (XMR) for about 5 months in summer (using 1x R9 290X+ 2x R9 280X) and finally quit around Thanksgiving because the XMR price was shit. However, I held on to those coins and finally sold them last September, when we had a big XMR spike and recovered the money I paid for my gaming PC (~$2k)! Had I kept on mining during 2015 - early 2017, I would have made much more, as many of my friends did mining ETH. But hindsight is 20-20. Anyways, what I have learned from that experience is that always think about the long game and price of cryptocurrency (if it is any good) will rise eventually and you need to be patient.
Good luck!
Thank you for your input!
Well the GPUs I ordered are coming in one by one, so who knows? According to the online store, I will get the last two of the five by august 10. Anyway I'm already mining with my 5 nVidia cards now (2x 1070 and 2x 1060).
I'm not expecting immediate returns, but it's true that I'm making this investment from my credit card (although with a 0% interest for 12 months, IE: $1200 = $100/month for 12 months). I made my calculations back in mid june when I decided to go for the mining, and back then I calculated a ROI of about 4 months, since ETH was around $350. Right now I'm hoping for a ROI of 8 to 10 months just to have a good sleep after and then I can play the long game, hold on to coins without a worry and such.
My problem however is not with the mining itself, but with the future of these RX580 as mining cards. A 30% hash rate drop was already announced for AMD cards, and it's still under a question mark if AMD will (or can) do something about it. There is also the question if like in 6 months or so ETH will be profitable to mine (in general, not just with AMD GPUs) due to difficulty increase . If it wont be profitable, then I will regret not going the nVidia way, since those cards seem to perform better at other cryptos.