For some people who are jobless, its quite great to work here in Cryptoworld and earn bitcoin than doing nothing at home. And I think its good for the economy too, because everytime we earned bitcoin and converted it to fiat, we will be able to buy essential goods for daily living and we can help the market with that.
Yes I agree that Bitcoin is limited in supply but as mentioned already here, it can be forked.
Lastly, I think its not that hard to earn if you'll just strive hard and knows everything about mining-there are lots of mining sites if you'll try to research about it. And if you have lots of money, you can also easily buy bitcoins on exchanges and send it directly to your digital wallet.