Another factor, besides shipping (and customs, outside of the EU) is the manner of distribution. In the USA, Miele appliances are sold only through a very closely controlled network of Miele dealers. The vacuum cleaners are sold through a network of Miele vacuum stores; you never see them in a general merchandise or "big box" store. Some of the vacuum stores also sell dishwashers and washing machines. Some appliance stores that sell varied brands of washers and DWs also sell Miele, but in general these are upscale appliance stores that cater to higher end customers, not national chain stores that tend to discount their products. Anyone caught discounting a Miele is usually cut out of the network, so you never see discounts unless it is company authorized, in which case all of the Miele stores may choose to offer the same discount (some don't). Some of the Miele price tag is due to the higher quality, some of it is removal of the laws of supply and demand due to price controls.

Bosch took an entirely different approach to the US market. They built a factory in the USA and priced their products to compet with KitchenAid, considered one of the "prestige" brands in the USA. Their entry level machines are priced roughly the same as KA, as are their high end machines. They can't compete at bargain levels, but for people who can spend $600-1000 for a DW, they are quite competitive and always finish #1 in Consumer Reports ratings. Their products are sold by giant national chain stores (Best Buy, Lowes Hardware) to the point where they are almost thought of as being a domestic brand. In addition, parts and service are much easier to come by than with limited distribution brands such as Miele.

What I can't figure out is what went wrong with Bosch's foray into the US washing machine market. They built US-sized front load machines (70 cm wide vs 60 cm Euro size) but they received poor reviews and have been discontinued. Perhaps the US-sized machines were rushed to market without proper engineering. You can still buy Euro-sized Bosch washers here, for under counter use in kitchens or laundry rooms, and they have a niche market in smaller apartments (say NYC where the only possible location is in the kitchen, as in older European homes), but most contemporary US homes have a dedicated laundry room or area, built on the assumption that the washer and dryer are each 27 in/70 cm wide (in some settings, there is provision to stack the machines, but again usually the space will be 27 in/70 cm wide).