I've noticed in a few of my own and others' questions that the number of favorites exceeds the number of upvotes. I don't have enough rep to actually view upvotes/downvotes, so when I talk about other people's questions, I really mean that the favorites exceed the score, but I expect that at least some of these questions (which seemed like pretty good questions to me) had no downvotes. In any case, for my own questions, I can tell based on reputation gained/lost what the actual votes were on a question, and there are times when the number of favorites exceeds the number of upvotes. This implies that some users favorite a question without upvoting it. My question is, why would one do this? If a question is interesting enough to be worth tracking as a favorite, isn't it interesting enough to be worth an upvote? I'm wondering if anyone who has done this can explain the rationale to me.
Note: In case anyone is checking my question history and noticing that no question actually has more favorites than upvotes, I am asking you to trust me that I have actually observed this phenomenon. At some point, clearly the upvotes caught up, but there was a point in the life of at least some of these questions (unfortunately, I can't recall which ones) when they had more favorites than upvotes.