I assume you mean the yellow stars for
Detailed Seller Ratings because you already have
the star for feedback.
http://pages.ebay.ca/help/feedback/detailed-seller-ratings.html#calculated
How detailed seller ratings are calculated
The detailed seller rating system is based on a 1- to 5-star scale. 5 stars is the highest rating, and 1 star is the lowest. Detailed seller ratings don't affect a seller's overall Feedback score, but we take these ratings into account when we evaluate sellers to see if they're eligible for discounts and other benefits.
Average ratings are computed on a rolling 12-month basis and appear only when a seller has received at least 10 ratings. If a seller hasn't received at least 10 ratings in a category, the average rating won't appear.
Buyers can leave Feedback for a seller for more than one purchase. However, to make sure that the additional Feedback is calculated, each item must be purchased in a different week. For Feedback purposes, we define a week as Monday through Sunday, Pacific Time.
