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GTX 1070 x 2 = $600 on newegg. The rest of the unit sounds like a $99 PC with a $90 power supply. Looking at about 3.5-4 years to pay this off after electricity costs at current crypto rates, and that's if you aren't fighting with an air conditioner in the summer months. Sorry bro; GPU mining rigs are a hard sell these days.
The components are worth more than that actually, unless someone likes to scout used and untested parts on penny auctions on eBay. And then putting and setting it all up together to work properly and stable. I'm not to defend that here though... You are right, someone who is techy can put together a rig themselves, that's always been a case even for a desktop PC that's sold at a store.
But mining, isn't it more about speculative reasons? Instead of buying into crypto you buy yourself hardware that's versatile and holds it's value. Therefore hedging your investment against volatility on the market. With the hardware you mine and produce crypto that you can risk holding, buying other coins, re-investing, etc, sometimes being able to mine projects that have big price hike potential. It's more a diligent and long term game rather that passive mining. At least that's what I've learned from the big guys that mine with their farms. Their strategies seem to work because most of the hardware paid double for itself already even with the markets being where they are.
Also, GPU miners have their own advantages over ASIC's. First, you can only mine one algo with an ASIC. Second, you purchase an ASIC and by the time it's shipped to you the hashrate is higher than what you would have if you got the ASIC right away, making your returns even lower. Yes, the ROI on an ASIC could be shorter, but it's useless after that because the hashrate is up there in the sky. So basically you're just paying for an ASIC in hopes for it to produce your money back to you.
Just MHO. Others may not agree with me, but I've seen the results of properly followed strategies and they've taught me a lot.
