That's convoluted and difficult to describe, much less enforce.

Here's a better method: All advertising must be truthful, and all details must be spelled out plainly and visibly.

If the price seems great but there are gotchas, then: Keep the gotchas in plain sight so that a consumer can make an accurately-informed decision without having to go dig in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign on the door saying ‘Beware of the Leopard.'

No fine print. No asterisks. No illegible footnotes. No man behind the curtain. Just truth in advertising.