Of course they would, what makes you think otherwise, attractiveness has nothing to do with it, and who would say that Joanna Yeates was any less attractive than Merdeith Kercher?
I admit that some murders get more media coverage than some others for a variety of reasons, perhaps the death of a young black kid in the stairwells of Tower Hamlets, would not get the same coverage as a high-flying TV personality murdered on her own doorstep.
In the two cases you highlighted they gained wide coverage because of the strange disappearance of Joanna Yeates and the sexual implementations attached to the Merdeith Kercher case.