gold is "scarce" but not finite. the 1849 discovery of gold in California was a shock to the world.
the creators of bitcoin CLAIM the quantity will never exceed 21 million coins. however, the bitcoin "miners" earn newly minted bitcoins by participating in the accounting (blockchain verification/settlement/record keeping)
A couple questions to ask yourself:
- when bitcoin issues its, 21 millionth coin, will it stop compensating the "miners" who make the system go?
- what happens if someone "steals" a bunch of bitcoins ($500 million worth were stolen last year). Will bitcoin "replace" them, to keep the integrity of the system sound?
- what about bitcoin copycats? don't those lesser crypto currencies pretty much negate the concept of a fixed supply. New issuers pop up every week.