I honestly wouldn't recommend it if you don't know what you are getting into. There are a large degree of complexities involved with managing a mining operation.
There is a certain headache involved even with a couple of rigs. You have issues with drivers, fried risers, software crashes, GPU hangs, etc. The list goes on. Now extrapolate that to a sizeable operation with 100 machines. If you are assembling the rigs, that's gonna take a couple of weeks with full days' of work. You will most definitely run into issues with completed rigs. Eg: black screens, undetected GPUs, low hashrate, and so on. And believe me, troubleshooting takes the most time.
And don't think when you have all of them running that it'll stay that way. Rigs are bound to stop and you'll have to commit maintenance time to bring them back online. It takes a fair amount of commitment to run an operation.
And remember this fact: you won't meet your projected ROI. You will always need to use worst-case scenarios when predicting future returns. Difficulty is a steady incline. The more miners, the less rewards. And not only that, you'll be running with downtime. My operation always seems to have rigs going down. Can't bother with a trek to the datacenter as it happens all too frequently.
I've been in this space for years. Too many people think mining will bring them Lamborghinis and yachts. We are seeing a huge influx of eager newcomers that are diving right into the mining scene. They run a number on an online calculator and figure they have their retirement settled. Oh, they have no clue what they are getting into.
This is a very good and basic explanation what happens when you go into mining.
I agree totatly with Gladimor, i have only a few rigs, and the work involved in keeping them online most of the time is mind bogling to say the least.
It really involves a lot of hard work and frustration, and after a while, even if the profits are good, you really start to ask yourself, considering how much raw hours you spent on the farm, is it really worth it?
But...
Since you will have employees at your farm, it might be a lot easier, if they will be fixing your stuff if it goes bad.
The mistake i made was buying to much of this stuff, having it on three different locations, and since im a one man band it almost makes it a second job i guess.
Having a family besides mining sure isn't helping
And now i've also started trading..... Suicide is looking good right now lol.