Cheaper SCTP isn't quite enough—one of the major problems with lots of little TCP connections is that they all have their own backpressure, so you get things like worker processes that share a remote flapping their window sizes up and down in response to one-anothers' requests. Ideally, backpressure would occur at the IP layer (host-to-host rather than port-to-port) but SCTP gives you the ability to have a set of streams that share a backpressure "group" on both the local and remote ends.