I'm a new subscriber to this list. At least two groups are working on the issue, Sohngren and Mendelsohn of Yale for the US, and Perez-Garcia and colleagues of Vancouver University for the whole world. Both studies couple ecosystem models with models of markets and management.
Results are much different than earlier studies.
In fact, both studies find positive net effects for the economy, though negative effects for the producers. Both studies are in press. Not that I know. The required models cannot yet be applied at large scale.