I rarely upvote because doing so on HN automatically adds that article to your Saved section. I prefer to keep this section only for submissions to which I'd want to come back later (and I'm unsure if the "upvote to save" behavior can be changed).
Either way, view this as a great lesson in why getting conversions can be so tough. A person better have a very persuasive case for a stranger to go out of their way and click a button.