It seems clear to me that the OP who asks a question will accept an answer they feel most useful, thereby implying that the answer was helpful, which is equivalent to upvoting it. Is there a difference in reputation (for the answerer) between simply accepting an answer, and upvoting AND accepting it?
If an accept is worth +15 and an upvote is worth +10, some answerers will receive +25 if the OP does both, but some only get +15 if the OP only accepts. Is there a way to equalize all this out?
Is it just general etiquette for OPs only accept and NOT upvote, leaving it the responsibility of the OP to follow etiquette? Or is the OP's upvote not worth anything if they accept in addition?