Well it clearly doesn't cost QVC in postage & packing to what we are charged (Rodial TSV was £5.95 p&p, when I sent it back it would have cost me £2.80, that's £3.15 difference), and with the amount of money they must make anyone on selling products, they can't be loosing out by offering free p&p incentives.
I don't know any other company that charges p&p on each individual item like QVC do. it surely shows that people are willing to pay it for the product in question.
I also think if they are going to charge p&p it should be one figure figure per day or week or something (therefore the more you spend the less the postage is for us, but the more money QVC will get for people ordering loads at once).