I tried a Yahoo store several years ago. Two months later I shut it down - I was getting about one visitor per day - not one sale, mind you, one visitor. A several hundred dollar lesson ---> Yahoo, as a result of their huge customer base, has no competition. A sufficient number of people will look to them and nowhere else for whatever they are selling, out of laziness and fear of the unknown.
So whatever they do is not an indication of any overall market trend.
Seems that I remember they started out selling domains below cost. Also, I heard somewhere that you cannot transfer out Yahoo domains. A rather ugly business practice, if true.