If you don't keep adding extra gear from time to time, then you'll fall behind significantly where you'll have a hard time even getting 75% of your initial investment amount back.
What is your budget if I may ask? And at what hardware have you been looking? What country you're from?
The minimum cost for building my own solar plant are $10.000 and it was taken over 20 years for ROI, but I call this just saving some of my monthly bills. The solar plant might not have worth in this time.
You hear about solar roof used on houses? Those even cost almost $8000 which means it would took up long to reach your roi . Hardware mining would be profitable only if the electricity cost on your country is cheap if its expensive then dont bother to do mining farms. It would be useless and just wasting your time and money.
Well another option for them is to have an solar panel so they can lessen the electricity cost eventhough they are not on india, and i think i've read many people doing that and some of them got really huge profit from this doing, but for the other country well surely mining is not for them since electricity is the most expensive thing they will encounter and also the maintenance fee will be follow.
And the difficulty should really we need to look up so we cannot be fooled by any frauds who make a cloudmining scam as a business, its not worth to spend with and surely they will take our money if we go continue to invest at them,
Forget about solar panel - the initial investment factor is often underestimated. And if you look at China, the reason that it dominates the mining game is not that it has the cheapest electricity but the low cost of building a mining facility and cheaper price to pay for hardware.
Solar panel takes forever to ROI.