Hi,
IMO, let's get back to some true stories before we hop in either trying to mine or buying bitcoin as an investment!
Firstly, Bitcoin price is hovering around USD 130 per pieces by now! Since I have noted that you have written a post saying how many kWh suggestions if BItcoin hovering around USD 100? So if you thinking the price will only about there, what makes you a decision of only buying instead of mining it all by yourself? You are buying at USD 130 when you think the price will go at USD 100 only, it only brings mean that you are burning money slowly and not sort of investing!

Secondly, with a 40k of investment, since we called it investment and it should be a long term instead of touch and go! Yes indeed mining difficulty is keep rising and miner gets not that fast and not that much anymore! But 1 fact is the machine that you invest in are yet to stop and it is still continue generating a small income to you although not that much anymore!

Third and last, investing using only buying instead of mining only give you one way instead of multiple chances to reach your target! Lets get back some basic decision making! What makes you a strength in your heart to buy Bitcoin? Of course you see the market potential in Bitcoin makes you to purchase it and keep as investment! So if this makes you to do a decision to buy, then why don't you let it keep generating instead of only that amount in your wallet? Isn't it mining is more multiple way and buying is only a one way ticket?


Just in my opinion and I am not a financial advisor!


Cheers