Fucking stop it. Commas are already an informal delimiter after three digits.
3,333,333.33
3,333,333,33
One of these is clearly correct and the other is clearly an abomination.
Thanks.
Signed,
The rest of the world.
We actually just switch the comma and dots around (or don't use them).
So two thousand ninety-nine Euro and ninety-five cents becomes:
€ 2.999,95
In holland we usually round numbers, leave out the dots and currency signs and end things with a dash.
So this:
€ 2.999,00
Becomes this
2999,-
We generally don't use the dots until the numbers exceed 100k.
When we still had our own beautiful Guldens and not his hyperinflated fake monopoly money it looked like this
ƒ 2999,-