The problem with the ad experiments is that there are too many other variables to know if what you changed actually changes anything. Maybe you would have had a really bad stretch with horrible sales and the increased ad rate kept you level. Maybe you would have had an incredible sales stretch and the change in ad rate held you back after the listing changes. Maybe inventory is better or worse on a given stretch. There just isn't a way of being accurate with that information IMO. I think you would have to have 2 identical stores and identical listings to actually see if there was a difference. I do think it helps, but not enough to matter that much. Your actual inventory, prices, sales, offers, etc are much more important. But I wouldn't turn off ad rates. I think ebay would punish your store. Just keep the number low.
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