Unfortunately that ad was powered by Google Ads. With google Ads, the host website (in this case WDWMAGIC) does not have any direct control of what is displayed. It is in Google's hands to only display ads that are appropriate for the host site, and they usually do a very good job of filtering out any problem ads. I do have the capability to opt out of certain ads, but I can only do this once they have been displayed. I have now blacklisted that ad, and it will be removed from Google's rotations once in a few hours.
To answer the other question, Premium Members (those who support the site by paying a monthly fee), do not see any ads on the forum. They do however, see ads on the main site.
Hope that explains how things work, and if you have any questions on this, just let me know in this thread.
Thanks.