As long as there are mailing lists for sale there will be junk mail. It is one of the cheapest ways to get exposure. Capital One is one of the worst offenders in my mail box. Almost every day, two promos from them (among other crap), one to me and one to my wife. I now recognize the envelops and just tear them in half and ****can.
I have a selfish reasons for liking junk mail though, I spent 35 years in the paper business and JM pays my retirement.
I know what the environmentalist (lunatic fringe) will say but keep in mind, trees don't live for ever. They die, fall over, get blown over, burn, whatever and paper does deteriorate over time. Trees are a renewable resource.
I could give you the marketing BS but I'm sure you don't want to hear it or will tell me I'm a tree murderer and this is most likely going to spiral down into a shlt slinging fest so I'll just save my time.
Keep that junk mail coming!