I'm not a big fan of souvenir shopping,so I'm probably not the best person to answer, but I don't think there is much difference between DLP shops and those in WDW. The only think we've bought recently is a set of frosted glasses with a Mickey outline discreetly etched into them (bought at Lily's Boutique on Main Street).
Don't think I've ever seeen GoH badges on sale in Paris.
As for Ears: some people wear them, but almost exclusively kids. I don't think it would makepeople to think "obnoxious American", and would more than likely just raise a smile from fellow guests as well as Cast Members.
Sorry not to be more help on the shopping side of things.
Regards
Rob