For what it's worth, I run an eBay store and this is how their promotions work. If you use a coupon (with a few exceptions, where the seller must explicitly op

For what it's worth, I run an eBay store and this is how their promotions work. If you use a coupon (with a few exceptions, where the seller must explicitly opt-in), that comes off of eBay's bottom line. Same with eBay plus - we'll get an additional credit (usually AU$4) to cover the difference between regular and express shipping. Of course, they more than make up for this by taking a 10% cut off everything you sell through their site.