Default Privilege Table ANY ROLE

Hi

I d'like my user be able to select on any new table from other users.

> ALTER DEFAULT PRIVILEGES  FOR  ROLE "theowner1"  IN SCHEMA "myschema" GRANT  select ON TABLES TO "myuser"
> ALTER DEFAULT PRIVILEGES  FOR  ROLE "theowner2"  IN SCHEMA "myschema" GRANT  select ON TABLES TO "myuser"
> ...


Do I really have to repeat the command for all users ?

The problem is I have many user able to create tables and all of them
have to read each other. 

Thanks



-- 
nicolas