Quality comments that continue the discussion, offer new viewpoints, or answer questions should get upvotes.
As I understand upvoting, the weight of the upvote decreases over-time each time you upvote. When you take a break from voting, your upvoting weight regenerates. I like this because it encourages a person to take a break, generate content, unplug, do something else, or just live life.

Thank you for contributing to the steemit community by bringing up an interesting topic and stimulating conversation (comments) on it.

Steem on,
Mike