If I'm searching for stuff, it's not that likely that I'm going to want to buy, because that's not the sort of searching that I, and many others do. If I want to buy a product I'm more likely to use a search engine to find a shop and take it from there.
I remember when I was doing the 'Microsoft Chimps' (sorry, Champs) project, all that they could focus on was money, money and more money. Which was really rather sad and short sighted. Because really, I'm still seeing less and less reason to use Live. Which is good news for Exalead and the other contenders.