My understanding is that bulk mail essentially subsidies individual mail to a large degree.
I do dislike getting ads in any form though. They have recycle bins in my P.O. Box building so I toss any flyers right then and there. When I used to get delivery it always annoyed me having to bring trash from my mailbox into my house to recycle it.
It's also an excellent vector for scamming the elderly. There are literally legal businesses who's entire model is fooling seniors into buying stuff (sending money) by making their communication look similar to government agencies and other legitimate bussinesses.
I do dislike getting ads in any form though. They have recycle bins in my P.O. Box building so I toss any flyers right then and there. When I used to get delivery it always annoyed me having to bring trash from my mailbox into my house to recycle it.