Well, I added up the cost of the components alone and it's $4776.53 before taxes and shipping. If you make $597.83 net per month, that will come out to $7173.96

Well, I added up the cost of the components alone and it's $4776.53 before taxes and shipping. If you make $597.83 net per month, that will come out to $7173.96 per year. But $597.83 / month is not the net gain, it's the gross gain. You need to subtract the cost of the utilities used to run your machine, and you need to subtract income tax, assuming you are following the law. I have no idea how often the individual components break down, but you'd have to take that cost into account as well. You'll probably want to upgrade components as they become obsolete. Then there's the thing about there being no guarantee that cryptocurrencies will continue to be worth something at all (market/concentration risk). If your rig doesn't make as much money as you were expecting and you need to sell the whole rig for parts, how much will you actually be able to get back? (liquidity/horizon risk) The point is, this comes out to a lot of work for only ~$2000 for your first year, and it's not guaranteed that the subsequent years of running the rig will be without their own costs. At first sight, a 33.5% return on investment looks great, but you need to consider the risks before jumping in.