It looks like Ebay/iGive has a 20% contribution to the Kiva Shopping Club, see below from iGive website
Special Rate Donation at eBay. The following rules apply:
Donation is 20% of the EBAY REVENUE/FEES, which were paid by the seller of your item(s). For NEW, active eBay members: $10 donation (must place bid/Buy-it-Now within 30 days of joining eBay).
Shane
Note that that's 20 percent of the
money that eBay receives from the seller, not 20 percent of what we pay for the item!
But it's all good!

Dottie B