Congrats Yun9999.
I like to follow your build but i calculated a bit.
I think it will never pay out the costs you invested.
If you need new gpus every 3 years (100 gpus but no risers no cpu no psu no mobo) and u pay electricity lets say 15 cent a kWh then its not more then a hobby.
But i like your work
BR
I wouldn't even consider this hobby, if I had to pay 15 cents / kw. I've been mining since the Antminer S3 days, so most of this is reinvested money. As for GPU mining, I'll be fully ROI by June / July if I don't count the power upgrade and shed build. This is not counting the equity I have in my gears. If I were to sell off everything I have today, I'm in the profit.
My purchasing cost for GPUs and most equipment are 19-29% cheaper than retail. I don't always buy the most expensive or coolest new stuff. I started off with only 2 windeevents for the garage intake ($150 / pair so they're not cheap) and 1 exhaust fan as well as cheap wooden rig frame that I make myself. I now have 4 pairs of Windeevents and 2 exhaust fans still much lower of an investment compare to most people at my hash rate who's 1 high end exhaust fan would cost more than my entire setup. I also started with IBM server PSU for the lowest cost per GPU to power. I invested most of my money into mostly HASH over the past year, not the coolest new GPU or rig frame.
Now that the income is steadier, I'm using some of that for Fancier upgrades. I run custom ROMs that are FREE for me with the help of forum buddies like Kilo17, Marvell and many others. I also get a lot of cool products that vendors and forum buddies send to me for free to try or as thank you gifts for helping them, such as Power supplies, break out boards, Fans, risers, etc. Some of the products you'll be seeing me doing the reviews in this thread later on.
Am I making a ton of money? NO, that's the hobby part. I'm a 1 man show and if you count the numbers of hours I spend on this hobby vs what I get paid for my REAL IT day job, then you would say I'll never ROI in a million years. Haha. I love this hobby so to me, it never feels like work. I could house everything I need in my garage without a shed or further power upgrades. However, I have a friend who loves mining but is sick and tire of his hosting company and his electric rate is super expensive. That's when I suggested he host his gears at my house. 2 of those Server racks are his. Here is a picture of his journey loading up the rental to the max driving from California to Houston to bring his rigs. We also built some more rigs while he was at my house. I learned GPU mining from him so I felt very good to be able to give back. He is also the devil whisper that keep on saying "Nhan, add more rigs" and I'll always be saying NO MORE, I can't handle all this heat. This is what forces me to have to be more creative with my hosting solution as I'm twice as careful with his gears then my very own.