I don't think I know anyone in Germany who doesn't keep eggs in the fridge, with the exception of my mother, who keeps them in her larder, which is rather cool even in the summer.
In the shops eggs are usually not refrigerated, true, but it isn't as if eggs went bad overnight, they do keep several days, if not weeks, at room temperature, and I suppose most supermarkets have a high turnover, so that the eggs don't spend that much time outside of a refrigerator.
As to the "hoarding" question: I'm quite good at hoarding myself, and so is my mother. Most people her age and older are, I think, due to having experienced a war, rationing, food shortages etc.; didn't we have a thread recently about the older generation being unable to throw away food, even eating things that we would chuck in the bin because they're off?
Of course this depends on the space you have. My parents live in a house with a spacious cellar; so do I. But as in Germany many more people live in flats (with very little extra space for storage) than in the States or in Britain, they might find themselves unable to hoard as much as they might do otherwise.
@redhoney: Willst Du nur wissen, was in den Kühlschrank gehört? Was man "einfach immer zu hause" hat, kann ja auch im Keller oder Küchenschrank aufbewahrt werden.
My fridge in Germany always contains low-fat milk, eggs, butter, lettuce and/or rocket and/or other salad vegetables, parmesan cheese, mozzarella, cream cheese, yoghurt, several varieties of mustard, white wine, a bottle of Sekt, jam (opened), soy sauce and various vegetables (whatever is in season). More often than not it'll also contain curry paste, yeast, fruit juice, beer, various cold meats/sausages, cheeses, bacon, opened jars of various sauces/condiments (currently: home-made peach chutney, teriyaki sauce, various sauces to go with barbecued food, ketchup, low-fat mayonnaise, oyster sauce, pesto) and, at least at weekends, also meat or fish.
The freezer part contains whichever leftover meals I've frozen (especially soup), frozen vegetables, meat (chicken breasts, minced beef, sometimes a chicken/guinea fowl/other bird), fish, bread/rolls/croissants, cake (home-made and/or bought), herbs, puff pastry, spring roll/wonton sheets, cold packs for sports injuries ;o)
I'm sure I've forgotten half of what I hoard there, and we haven't even started on my cellar yet ;o)
Edit @Schneiderin: Knoblauch und Tomaten habe ich auch immer im Haus, aber nie im Kühlschrank, ich dachte auch, dass ihnen das nicht guttut. Auch Obst (Äpfel, Birnen, Bananen, Ananas, Mangos...) habe ich meist nicht im Kühlschrank. Avocados dito. Gemüse dagegen kommt bei mir meist in die Kühlung (oder in den Keller, z.B. Kartoffeln).