In June, eBay sent out offers to some of its sellers. The offer was to sell for the entire month for only $50 instead of its regular 10% fee. However, fine print read that the sellers will receive credit for the net difference, hence they would bill the actual amount for the month of June, equivalent to 10% of sales and then later credit them back the difference, hence they can show higher quarter ends number.
There are tons of sellers, who took advantage of this offer and sold high end items, that are complaining about this online. I guess they didn't either read the fine print or eBay was deceptive in their promotional advertisement, and they got their credit cards automatically billed for hundreds of dollars instead of $50. Either way, this credit will be refunded to the sellers in the future as it is not really a "earning".