[cakemuncher]

That depends on which English speaking country you're from.

[chii]

I know of no English speaking country that uses the comma this way. But plenty of non English speaking country does it.

[Cakez0r]

England uses the comma this way. I.E. would format it 10,000%.

[pluma]

I think you misread the thread you're responding to.

The OP used a comma as decimal point, not to as a thousands separator. GP likely meant they know of no English speaking country that uses the comma as decimal point. Your example doesn't contradict or add to that.