My guess it's because the production cost is too high, and counterfeit euro coins aren't a big enough problem to warrant them. Also having a germany-only euro c

My guess it's because the production cost is too high, and counterfeit euro coins aren't a big enough problem to warrant them. Also having a germany-only euro coin in wide circulation would be a bit backwards and impractical, so they would have to implement them in all 19 euro countries.