"Selling the OC" has really given "sugar daddy" seekers a major boost ... cuz this season they're peddling more than just homes -- with one dating site seeing a big boost of visitors. Here's the deal ... on Season 4 of "Selling the OC," a website once used to connect thirsty young ladies with sugar daddies has been all the talk -- ever since Ashtyn was accused of meeting her husband, Jeff , on the site. Turns out that's been great for business, because a rep for Seeking.com -- formally known as