ssgumby - 1:05 am on Jan 18, 2013 (gmt 0)

we use them in addition to adwords. We base our use on cost of sale. For us, if we can get a shopping engine running at 10% or below for cost of sale, we stick with it. Some of these product feed sites just simply have mass quantity of users, amazon product ads for example, the cost of sale is for us is only just under 7% and the amount of orders we gain from there is pretty impressive.