Well, with Call Me (and all other non-RBN RB DLC), the basic role of the record label was to send masters to Harmonix and receive money.
By publishing songs themselves via the RBN, they now have to make the master tracks into a fully playable Rock Band song on their own - either by hiring an authoring company or having people within their own company do the work. Though there is a huge advantage in the RBN of selling a ton of songs on Rock Band without having to wait for your turn in Harmonix's long DLC queue, there is now the burden of expenses incurred by getting the music in the game. Their perspective may be that charging an extra dollar on top of the standard $2 price point is a way to make up for those additional expenses.












