“Who would pay $100k for a bitcoin?”

It’s an exchange rate, not a price tag.

The exchange rate between the USD and Iranian Rial is $1 to 42,250 rial. If you had a hunch that that exchange rate was going to $1 to every $100,000, you’d probably hang onto that dollar rather than asking “who would pay 100,000 rial for a little green paper rectangle?”