well, junk mail IS restricted in the sense that whoever sends has to pay to print the materials and send them out . . . unlike spam where the sender has to do neither.
I have no problem with junk postal mail, it is just one more form of advertising . . . without advertising, this would be Somalia. I may be prejudiced tho, I use "direct mail" advertising in my own business, and it is marvelously effective, I get far more bang for the buck than any other medium.
If I had a choice I would much prefer to eliminate billboards. at least, junk mail I can throw away. Sure, I wish I only got mailings for products I want to buy, but . . . how am I going to know what's out there without my tigerdirect catalog?
what I truly hate about spammers is, more than half the time the links in their e mails don't work. (I'm always hoping to find a way to send them a bogus order or a nasty message) Sometimes i think these misfits send spam just to be annoying, not to actually sell anything.