So far as I know there isn't any rule against upvoting lots of someone's stuff because you genuinely think it's good. Or downvoting lots of someone's stuff because you genuinely think it's bad. What's definitely not allowed is upvoting or downvoting someone's stuff because of what you think of them (e.g., it's a friend, or they said something that annoyed you).
Unfortunately the two can be hard to distinguish sometimes.
@bobble, i wanted to apologize. i realized while you were gone that i was probably the one serialing you unintentionally, i had gone back through some of your old puzzle series while we were chatting and upvoted them because i thought they were neat and genuinely forgot there was a serial upvote rule. that's completely my bad
but some polio survivors still had to use them (because most other devices assume your spine is straight, and severe polio cases tend to deform the body)