[okie01]

Hitler would have eventually gotten around to Switzerland on general principles, but he never invaded them simply because he didn't consider them very important and didn't thing Swiss territory was of any strategic importance.

Switzerland was also a place where Hitler's Germany could do business with other countries, through Swiss intermediaries.

Belligerents often find such an arrangement handy to have around.

[Lowell1775]

“Switzerland was also a place where Hitler’s Germany could do business with other countries, through Swiss intermediaries. Belligerents often find such an arrangement handy to have around.”

You nailed it.

Same story with Sweden and Spain in WWII. As with Switzerland, the benefits of honoring their neutrality outweighed the cost of a war to secure them.

The cost of a Swiss campaign would have been very high given the hostile terrain coupled with the large and well armed/trained citizen army.

Better use of men and material elsewhere at the time.

If I recall right, the Swiss also cooperated with the Nazi’s and allowed scheduled military trains to cross their country to and from Germany and Italy. Think they may have also have maintained a solid trade back and forth including war materials.

What a deal.