with the beneficiary you can for instance work together with people on one article, and then share the revenue.
or ehmm write an article about a certain subject and 'donate' the revenue to an account? I have to try this out myself...
Say, I write about walk of hope, and i want to share 50% of the articles revenue TO walk of hope, then i can make WoH 50% beneficiary.

So this is a pretty interesting steempeak feature:-)