You can do only once per post, no big harm can be done; be your guest. Just ignore the number. It's a relict from times where unneeded down voting could be compensated. Just ignore.
Did you up-voted yourself
haha i did up-vote myself... just to prove a point.
When i'm reading through a thread with 100+ replies, i skip over the ones with 0 up votes because I find them irrelevant. Now that may just be me, but I feel it does artificially inflate a comment. I understand the history of posts and being able to counter down votes, however, we've already removed down voting.
My two cents. or 100,000,000,000,000+ cents
edit: I left this post untouched with my own up-voting