WTF is Going on with Guitar Hero?

"That’s it. That’s May by the look of it. We’re not sure if the point of GHWT DLC is to make people glad they bought Rock Band, but it seems to be working. It’s odd. There are significantly more copies of GHWT in homes than Rock Band. That’s a fact. Thus there’s more coin to be squeezed from said punters, because there’s more of them. That’s maths. It’s a reasonable question to ask then; why is the Rock Band DLC trouncing GHWT DLC in quantity and quality?" – from gameplayer