The concept could first be implemented near Berliner Sparkasse banks which are located in the heart of the city!!!
A free bikes service would be offered to the berliner sparkasse customers who could unlock bikes by simply using their bank card or a pin number given by the bank to their current customers and new customers. This would create a certain control on the bikes!
If the concept works well ...which I think it will :) ...next year's budget could be spent on more bike stations and repairing the bikes that could have been damaged!
This concept would offer a great non-polluting way to get around the city, by saving money and helping the environment, therefore creating a better berlin :)