It doesn't directly subsides it, however it keeps the overall volume up. It costs them about the same to deliver 1 letter to you as it does 5. It also costs t

It doesn't directly subsides it, however it keeps the overall volume up. It costs them about the same to deliver 1 letter to you as it does 5. It also costs them even if they deliver nothing to you. So in that regard, the bulk mail does help out.