I disagree, unless you are totally socially maladjusted and / or can't get a clue how to behave in social situations.

Practice makes perfect. If someone has seen you 9 times that typically means you met a LOT of people, and therefore have had a lot of practice in talking to people. Most likely by that point you won't be "annoying and creepy" anymore, and if you still are you'll definitely be much less so.

In addition, if you talk to someone for a 9th time then by that point you practically know each other and probably share some interests. They won't talk to you for a 5th, 6th, 7th and 8th time, let alone a 9th time, if you are annoying.