Prize drawer offer from reader's digest

I got a weird prize draw offer from reader's digest. As far as can tell, it's not a scam in that it actually is from that company, and is legal, and is what it says, but is a scam in that it tries to make itself look really important, and deceptively implies you've gained something by receiving the offer.

AFAICT the intention is that you, lured by the offer, are fooled into buying the books they're trying to sell you. Which is definitely deceptive, even if legal.

Also, that you have to jump through lots of hoops detaching stickers from various bits of envelope and leaflets and putting them on things to enter -- so presumably their hope is that most people fail to do so correctly. Although, now I think about it, I don't know if that can possibly be correct -- if they're only offering a chance to enter a prize draw, then why does it matter how many people enter, assuming SOMEONE manages to do so?

And AFAICT if you send it back saying "yes, enter the draw" but "no, don't sell my any books[1]" you do in fact get a (very small) something for nothing.

Does anyone know if that is in fact the case? I shouldn't care, but I so rarely get postal scams any more, it's sort of retro :)