The enormous value being money laundering? Also the miners ultimately have to swap for some fiat, so they can’t stay in BTC “heaven” forever. Further buyers set the price, not miners. Especially given that using BTC is a luxury except for the underbanked, who also don’t have money and are selling their BTC to get some.

If money laundering is the only use case btc has, and it is the best way to do money laundering, it's going to make a lot of people rich.