Now let's see if the 1000 CHF note is still here to stay (https://www.theguardian.com/business/2016/feb/16/1000-swiss-...). I assume that the 1000 CHF note is only sort of useful, because you can't launder it nearly as easily. With a 500 Euro note, you can spread them around and deposit them in many countries. With a pile of 1000 CHF notes, someone is going to notice.