I'm seeing cases where I've earned $0.03 cents, does ebay even offer a listing service for $0.06 cents?
The lowest standard listing is I think .10 cents (insertion fees) and 8.75% of selling price (final value fee). However, I sell on eBay and I get promotional listings all of the time. 1/2 off or 1cent listings, etc. So you could have a promotional listing where the seller paid 1 cent to list and it sold for 99 cents or so.