I assume that if you view mining as a long-term investment, then perhaps this can lead to an increase in the number of coins in the long run, but this is also much more risky. First of all, the miners can break down, and even if you take them somewhere, an accident happens. There is also no way to know how high or low the complexity level of bitcoin mining will reach such numbers, which can dramatically change. If you want an immediate win, I would definitely go with buying bitokoynov instead of their prey.
Buying bitcoins is much easier, cheaper and takes less time. You better buy and keep the BTC.