This is probably the smallest gain I'd ever made from selling my stuff on eBay Singapore so far.
Cost of Singapore 2008 CLEO postcard: FOC (given by my daughter)
Auction price paid by buyer: $1.00
PayPal commission charge: 53 cents
Cost of 1st Local postage: 26 cents
Cost of standard envelop: 10 cents
Gain from auction sale: exactly 11 cents
Positive feedback to be gained: Priceless