They make it look like you're getting a lot more than you really are. It's a 'sneaky' trick.
It's a 'sneaky' way of getting people to buy something they don't need.
a 'sneaky', untrustworthy person
(..) I knew how this would be settled in the animal world. But this was Girl World. Your hair looks sexy pushed back. And in Girl World, all the figthing had to be sneaky. All this cranberry juice is making me break out. Wait. I have this really good skin stuff I'll bring you. OK. (..)2004 Mean Girls