Value of single full coin doesn't matter at all as the value is determined only by a marketcap.
Exactly.
Coin 'A' has a price of $1 and there are 10 million coins.
Coin 'B' has a price of $10 and there are 1 million coins.
Both have exactly the same
total price.
The price of an individual coin is utterly irrelevant unless supply of coins is included as well, which is why marketcap is the measure to use.