How could a single unit of something be so valuable?.... How could a single BTC have the purchasing power of 100K dollars?
How can a single metric tonne of gold be worth so much?
In some countries, like India, gold is part of daily life and built into some aspects of religious and culture displays of faith, status and acknowledgement or reinforcement of social connections. Therefore, the price of gold is driven by the
need imperative to buy gold jewellery.
We need to make Bitcoin part of all religions or social displays (

). BTC donations at the end of sermons, BTC as birthday presents, BTC as dowry, etc.
1 BTC for the boatman.
The scarcity and high price of BTC is the thing that would ironically reinforce its desirability, and the circular path is laid.