Vendors and Merchants will advertise on your site if you have a viewership that aligns with their target market. eTRAXC helps with this alignment.
Vendors and Merchants will spend money on ad placement if they have control over things like when the ad apears.
Your site has a global market? Great! There are many vendors looking for that. Your site has a niche market? Great! Target those viewers on a site that covers that market.