@donkeypong - An interesting comparison of Steem exchange with the barter of the real world. I enjoyed reading about the barter (even toll booths accepted items instead of cash was interesting to note!)
The barter experiment involving the street musician and the hummus lady was great. Had not realized such exchanges were possible.
It is true that, by donating SBD or Steem, ultimately you also may benefit because the resultant chain of events may lead to increase in Steem price and/or growth of Steemit. However, that is no different than gift giving in the real world. The 'value' created by gift giving, even if it is just goodwill, ultimately helps us in some way.
Thanks. Very interesting read. Upvoted full
Regards,

@vm2904