I think a strong use case is for sporadic tipping, like for street performers. Many people don't want to physically take out their cash, nor are they sure how much they should give. Also, with an upvote, you're not computing the cost in the same way as when you're handing over money.
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I really like that usage. It keeps in the spirit of the platform too in creating quality content as well. I would love to be able to reward a street performer in this way, hell, just a couple weeks back there was a shadow puppet artist that I would have loved to give a full 100% upvote too!