yeah i concur, the bitcoin network is as secured as it get, no place for casual mining all is in big farm now
The only reason big farms are profitable because they have profitable conditions. You could equally have a small amount of miners, or just one, in good conditions and it would still be profitable.
For example, you live in a place with low electricity costs, you buy an Antminer or Avalon miner and put it in your basement/garage, then boom you're mining and it's profitable. Often it'll still be more profitable than most investments which we forget tend to actually only get ~10-20% per year for people, and this is riskier but it's not so risky that it makes it unreasonable. Cooling systems etc don't necessarily need to be very good or even in place at all unless you're already doing a big operation.
it's peanuts you are making with just one, you will never roi, having more than one guarantee roi on at least part of the other miners
and also having a very large farm guarantee that you can add more easily new miners, without compromising your roi time too much
this si a huge difference between a person casually mining bitcoin with a single asic and a chinese mega farm
I'd say the only thing is that it stabilises the income because you have several and they're not all going to fail at once, but if you have just one it'll be working for over a year in most circumstances and you will ROI a large amount relative to the amount you invested. You don't need to ROI a large amount if you only put in a small amount, and if you have profitable conditions you should ROI unless your miner breaks.
In all investments having more money means that you can do better, but in this case the profit is pretty much proportionate to how much money you put in, as long as you have a decent place to put the machines.