I am a complete noob when it comes to PPC. So after reading up on it i opened up a YSM account with the $100 voucher and jumped in. After a little bit of initial confusion related to the clunky yahoo interface, i started a campaign aimed at some items from ebay that i have listed on my site. I started out with low keyword limits and a low daily limit, and only sponsored search results so i could learn while i eased into it. So far so good, ads are showing and i'm getting a little traffic. Now, i've noticed that my ads are showing on ebay. This is where my dilemma lies. Should i block ebay from showing my ads, or should i let them continue to run? I see two possible outcomes from having my ads shown on ebay. Maybe there are more. 1. The person is already at ebay and they'll most likely not be interested in going to a different site only to be shown ebay ads again. 2. The person can't find what they're looking for on ebay, and would be happy to see that i have a more complete and thorough listing that includes many variations of their search that they missed. It's way too early for me to be able to tell by # of conversions, but i wonder what your thoughts are and how it's worked out for you?