You increase the daily/monthly active users count if they count only visiting people as well. Only by 1, but still. If they are using that number in any kind of negotiation with other companies to persuade them to do business with them (ad-related or otherwise), you probably wouldn't want to increase that number.
Not much, but it's honest work.

Edit: I'm not talking about this message in r/place in particular. I think this is awesome!