I recently encountered a case where someone - a new user who didn't know any better - serially upvoted the answers of a user who'd answered their question. After they mentioned this in chat, they were told not to serially upvote based on the user, and the votes were reversed.
I also linked the user to the /help/someone-answers page, which contains useful info about what to do when you receive an answer. However, when I went to look at the page myself, I noticed that it's actually pretty short, and is missing some things that I would have expected to be in there.
Among these are mentioning not to go serially upvote a user. The page should make note that this is not something that is encouraged when you get an answer.
Another thing that I'd expect to be in that page is a mention of the bounty system (and a link to the relevant help center articles). These two things are related - instead of serially upvoting, add a bounty.
Something like this:
If you found the answer especially helpful and would like to reward the author in an additional way, you are welcome to start a bounty and award some of your own reputation to the author. Please do not go upvote posts written by that person simply because this answer helped you; vote for the post, not the person.
This would be especially helpful if we link a user to /help/someone-answers when they first receive an answer. (Also, reformulating the help center article on bounties to focus on bounties that reward an existing answer would probably be good if this was to happen - currently, the existing focus on drawing attention could confuse new users following a link from this page.)