All these deposits are so low. Germany has 25 cent on non-beer plastic bottles.
Which means when buying a 1,5 liters bottle of water, the bottle is worth more (25 cent) than the water in it (19 cent).
Bottle collectors are quite common, haven't met any rude ones myself, but they are even speed-collecting trough the trash cans of trains stopped making stops at the station.
The prices are in Danish crowns, and aren't that far away from the German ones, although some consideration should be made for the higher cost of living here.