What is your opinion on the fair value of domain- Bitcoins.sydney & Bitcoins.Melbourne ?

I’ve not seen any sales data or real life use on either extension. Many great terms are available in both of them.

The plural is vastly inferior to the singular. But obviously the crypto market by default always has that lottery ticket aspect to it.

Very hard to come up with a fair market value for a name like this. But “BitcoinsSydney” isn’t taken in a single extension so that probably limits your upside quite a bit.