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I've received pms as an Sr Member from newbies or random accounts in the past that were obvious scam attempts. Higher ranked users are usually more experienced, but usually such scammers also aim for numbers, the most users they approach, the higher the chances of scamming someone.
Some scammers would DM high-ranked users as well, but it's very rare. I assume you haven't fallen into that scam, so the scammer knows it's not easy to convince high-ranking users. Another reason a scammer may avoid a high rank is because of a report. When I have seen such a message, I have been using the report to admin button. This means they will definitely get a ban, either temporary or permanent. But mostly newbies don't know about reporting to admins, and they might become greedy as well.