(note: abstracts from http://forums.moneysavingexpert.com/showthread.html?t=650139&page=2)
cryptoguru:
Apple MacBook MB062 2.16 GHz White
was on at RRP £829 ... but you get it free when you win ... that's 100% saving.
The bidding took it to £523.11 ... which the winner didn't have to pay (they just have to pay the delivery of £9.80).
Telebid got 523.11/0.07*50p = £3736.50
Whooaaa!!
They don't even have to stock the thing ... they can order it from play.com at £819.99 and you pay for delivery.
They made £2916.51profit on that one item ... and didn't even have to handle it or store it or even be nice to you.