The cost of buying cryptocurrency directly is too high, and the investment in mining is still much less than that of buying cryptocurrency directly. We have to control costs and risks
It looks like you've forgotten about the issues that might come with mining investments; It's not always going to be a smooth experience...
e.g.
- Dealing with faulty boards, PSU's and etc... > Shipping them for repair [depending on the situation, it could lead to additional costs] > Less hash rate.
The price of mining machines is now reduced.
I haven't checked if that's indeed the case, but I don't think it'll last forever...