At that point it's far superior to fly to the US, buy it, and fly back. Hell, have a nice week in a hotel and bring two.

Fly to a state with no sales tax. Portland, Oregon serves this purpose for high end shoppers that come from out of state and out of the country. Folks fly in to buy their Rolex, Gucci, etc, with no tax.

Doesn't work with Germany, you'll have to pay VAT at the airport.

What are they examining your bags for purchased items? That’s gestapoish.

1. Yes they will if they suspect you (age group, clothes, newest phone, certain flights like LAX, LGA) as all custom officers all over the world do. As my bags have been searched every time I've entered the US.

2. You should read up on the Gestapo

US customs won't care if they find new electronics, so they're no problem (they are annoying, with the suitcase thing at port-of-entry, but no problem). As for German customs, I don't know, but: do the initial leave out of Germany over the road where there's checks only in theory and leave from an airport not too far over the border. You can probably get a cheaper flight in the process (e.g. Fly from Basel)

The Germans look for electronics, the Americans look in the electronics and what’s on them.

Fly back through Geneva, and take some basic precautions, such as not taking the box. Done/done.

not nessesarily, but you'll have an issue if they do a controll, or it comes up.

Are you comparing prices with or without taxes? US usually prices without and EU with.