It is just like any business or investment in life, like trading or buying a coin that has dipped in the price. The fact that the prices are low compared to how they were during the bull market or before ETH went POS means it could be a better time to buy rather than the time of FOMO or when the bull market has climaxed.
I would encourage you to buy with spare money if you are passionate about the idea of mining but make sure you buy from trusted sources or you will get scammed.