Unsold coins aren't created, and will never exist. So, the total coin supply will be lower than if we'd sold out all coins.

Effectively, it's about the same as burning them, except that when you burn coins, and you want to know the total supply, you can't just look at the total supply as you have to then subtract the burnt coins.

It's easier in the long run this way with the coins just never being produced.

If you have any more questions, don't hesitate to ask.

Cheers!