The pamphlet may have a non-monetary value to someone, such as, for nostalgia.

With regards to the value of the pamphlet, it is written on the cover that its value is $15 (Party Suggestions). 

One can give a monetary value to a historical piece of ephemera like this one, but there can also be a historical value or nonfinancial value given to this pamphlet. Its historical value is for historians examining this pamphlet to garner important information about the era in which it was created, popular trends in the era, cultural and political issues, etc. It can also have a sentimental value to its owner; for example if someone owned this pamphlet in the 1950's or beyond, in the future they may have a personal or nostalgic connection to it and it may bring back memories for them. 

No further information about its value was able to be gathered through research.