Why would anyone pay for anything that says "NOT FOR SALE" on it.
Go to a ham radio fest, or computer show sometime, you'll find vendors selling NFR cd's all over the place. Microsoft and a few others try to crack down, even pay employees to rent a table with how to spot conterfit products and to keep an eye on the vendors at the show. Online you'll find great deals on software and when it arrives you'll find an old simm chip with a note to throw it away they are required to only ship the sw with hardware. So I guess that battle is still raging.
In the record collecting world the promotional not for resale stamp on a record generally increases the value dramatically.
So depending on what it is and what it's worth to you is people will buy anything, as my dad used to say "one man's trash is another man's treasure"
I think that by selling the envelope they get around a lot of rules.
Many people would fall for it - people who don't do their research.
Good morning, son
In twenty years from now
Maybe we'll both sit down and have a few beers
And I can tell you 'bout today
And how I picked you up and everything changed
It was pain
Sunny days and rain
I knew you'd feel the same things...