No, it helps both the author (me, in this case) and the curator (you, in this case). It's what makes Steemit awesome and how we all make a few coins while interacting. Authors only get paid when people upvote their content. And your curation reward is based partly upon how many other people upvote this post after you. So the sooner you vote, the bigger your reward. Resteeming spreads the viewership of this post to possibly increase the rewards to you and I.

Upvoting and resteeming are core requirements and functions for Steemit to work. :)

Part 8 just posted: https://steemit.com/diy/@greenacrehome/the-usd20k-homestead-part-8-the-grid