We think that the Bulletin ads may only be shown for users that either run the free/Basic account or who renew their account subscription directly with Davis. (It's common, for several reasons, for users outside the US to renew their subs with their local (ie in-country) dealer rather than direct from Davis. But I'm not aware of similar arrangements within the US.) So far, none of our Pro users who renew direct with us seems to have seen the Bulletin ads. But this may not be the full picture - we're still assessing and more details may come to light soon.
Really it makes no sense for ads to be shown internationally with US$ pricing - that's incongruous and semi-irrelevant, and more likely to annoy than to generate extra sales IMO.
Of course, the ads seem to be a new initiative and how the ads are deployed may well change. Always worth an email to support@weatherlink.com if you're unhappy with the ads, especially if you can cite specific reasons, eg international users seeing only $US prices or unwelcome layout changes etc. You may not get an individual answer but if enough unhappiness is registered then maybe a less intrusive option might be found.