I see potential for abuse here.
All it would take is a large amount of auctions that have a
final price < 9.99. Ebay give you $1 if you pay for something
that costs more than $2.
If you have a seller friend that post a bunch of non-sellable ***
and then you "win" each of the auctions at a cheap price the
seller pays .25 to list. A small amount to pillpoint(.35 or .39)
and the total cost to the "seller" is less than $1. Now at .64 * 100
per day is $36. Probably not worth the hassle, but....