Let's say you have Joe Bloggs Hobby Shop.
He has a whole heap of stock, some from big suppliers who would most likely provide the required certification upon request. From smaller suppliers, he could most likely access nothing (except maybe an email certifying that their products (books) are lead/phthalate-free but with no further documentation).
Is Joe Bloggs going to be that worried about all of this? Sure, he might focus on his miniature range making sure everything's in order but all his books and games too? Surely he has nothing to be worried about? I mean are a bunch of government accountants followed by a bunch of scientists going to come traipsing into his premises threatening him? Is Joe Bloggs going to worry about being sued in twenty years time because he sold an uncertified RPG book to Johnny?
Or is Joe Bloggs going to say that this "law" doesn't apply to him?
I'm speaking from Sydney, Australia here where in the main, it is considered ridiculous that you can successfully sue a furniture shop for damages relating to you tripping over your own child in their premises. YMMV - such legal action being seen as just, responsible and appropriate.
Best Regards
A somewhat bemused Herremann the Wise