@Paul - I'd like to think that we'd be more open to fresh faces starting out with Shopify. There's a level of abruptness in your reply that may make it seem far harsher than what you intended. Bottom line, Shopify doesn't have exact rules on who can post what where - it's more about common sense and politeness.
Since I don't see the Christine posting a pile of ads all over the place (and there wasn't any referral links) a single welcome style intro doesn't bother me. I would have been fine to see it remain in place. My mind would change if suddenly there was a pile more over the coming weeks.
As a sidenote, if you're posting canned responses this is a good way to make the forum bot fire into action and ban your account. It doesn't like the same user posting similar content.