funny part is.
if it costs $5000 to mine a bitcoin. but difficulty adjustmnts and hashrate competition dont make it a sure thing.
but you can buy a bitcoin for $4k and thats a sure thing. $4k guarantees you 1btc
then the OP's theory above becomes obsolete
why spend $5k mining with no guarantee of a whole 1btc,,
when you can spend $4k and guarantee 1btc and still have a bit of fiat to spare
Another funny thing from OP logic is, that if You mine a coin and dont cash it ever in, how can You get Your original investment back, however little You spent on hardware or electricity? And the person how buys Your mined coin, how will he get his spending back if not reselling it??