Sorry - my point was counter to your about DE, FR and IT having the same conventions, so it's odd CH doesn't too. They all use the same currency, whereas CH doesn't, hence why there'd be a different one (?). E.g. we use £1,000.00 in the UK.
DE, FR and IT have the same currency only the last 15 years or so. One would expect that they would be using the same conventions because of the history and relationships between CH and all of these countries.