Well, why think about this at all? With over 40 million visitors in April 2009 Germany has the largest online audience in Europe. At present Germans spent over 43 billions USD per year for online sales.
So, if you run an online shop which allows for international orders the likelyhood is great, that you will have also German shoppers.

According to statistics form 2008 Germans prefer to pay in webshops this way:
- 31% Banktransfer in advance + on account
- 18% Direct debit
- 16% Collect on delivery
- 15% Credit Card
- 11% Internet Payment Systems like PayPal,T-Pay,Click and Buy..

This means in practical terms: If you offer a German customer PayPal as the only payment option, there is a risk to loose him as visitor of your ecommerce website. That would hold true also with credit card payments only. Despite high fees Germans might still pay via bank transfer.

—
Source: BITKOM-12/2008