Online auction site eBay grew up on the receipts of smaller-scale sellers. Now, as the San Jose, Calif.-based company reaches out to larger, big-volume dealers, some of those original core customers are drifting away. Some sellers have moved on to competitors such as Amazon.com, said Charles King, principal analyst with Pund-IT. “I think a lot of the mom-and-pop retailers are probably looking to see if there are opportunities,” King told the E-Commerce Times. “Amazon has been getting a pretty good reputation for certain kinds of products. I think it’s rapidly evolving.”