Why does pgAdmin3 set OIDS=FALSE and owner to postgres by default?

Question

Why does pgAdmin3 automatically set the table owner to postgres when its created and set OIDS=FALSE? I am new to PostgreSQL and want to know the rational behind this default behavior.

-- Table: staging.mytable

-- DROP TABLE staging.mytable;

...

WITH (
  OIDS=FALSE
);

ALTER TABLE staging.mytable
OWNER TO postgres;