1) LARGE Sizes Offer A Better Response Rate
A larger size offers more real estate to convey your message, and has a better chance of pulling in your customer.
2) No Postage Permit Needed On Every Door Direct Mail Pieces
The standard EDDM permit will be used instead of a paid permit. Therefor you will not need to purchase a postage permit or renew renew the permit license when mailing EDDM.
3) You Don't Need A Mailing List
An EDDM campaign will hit every mailbox on the routes requested, so all you need address is "Postal Customer" on the mailer.