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I dont use ebay that much, but i do have a little insight into the general topic. In our company we have accounts with a couple of large companies, who like many large companies, are VERY protective about their brand. One of the companies in particular is extremely concerned about its brand being devalued by association with ebay and they go a fair old way to ensure that supply of their products to ebay sellers is as minimized as possible. They even have a department dedicated to ensuring their brand is not devalued or associated with discounting or cheap deals, etc

This might explain why you dont see too many big companies selling on ebay, although i am sure there would be some.

I do not remember seeing any big company selling its products on eBay, but there's a start for everything.