People get interested in mining because it seems free but if you want to hold BTC or other coins, it's best to just buy them with cash. Miners tend to have close to free electricity
you can still earn good without having very cheap electricity, just take any calculator and you will see that the roi time is not that bad now with this value of bitcoin
with the possibility of bitcoin increase even more the profit will remain high for a long time, the diff won't catch it soon enough