Never upvoted my own comments... 1% of my voting weight isn't much so it probably wouldn't even move, if it was worth anything i would probably do the same thing tbh, but just on the comments that i thought were "good" enough for it
Asking for something or providing good information is already doing more than a large % of the people that comment!
When you comment posts in hot or trending there will always be the annoying spammers. 1% upvote is nothing, but it moves the comment above all the spammers (because they usually dont upvote their comments or get flagged) and the comment gets much more visibility. It works for me.
Reading the posts and writing "interesting comments" should be self-evident but ...