When you win something for far, far less money than it's worth.
A beautiful butter-soft leather jacket has arrived for me today. I was the only bidder and paid £5 (I was prepared to go higher). The postage was £4 but she's sent it 1st class recorded which was £5.65 without counting the price of packaging. She's sold it to me for less than 3 quid then hasn't she?
I've given her top rate feedback and sent a personal message to say thanks. I feel like I've ripped her off though. Am I being ridiculous?