*nods* for PtP, I agree. As a buyer (and a seller) waves, waves, waves. As a seller, it's less stuff for me to manage. As a buyer, I don't have to trust you on oversubscribing a wave because you can't. You can oversubscribe the hell out of an Ethernet circuit, though.
Waves are much harder in a PtMP environment, especially with cross connect costs.