I agree 100%, loss leaders are to get people in the door....buyers on eBay are already "in the door".
You might be better off with a special offer instead of a special price....free shipping or buy 10 get one free or some such.
Personally I'm not big on discounting. When I ran B&M retail we did advertising and promotions but in that case the SUPPLIER paid for the ads and discounted the cost price. (which is sort of what eBay's double discount for free shipping thing is all about).

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.