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
(..) If you know what's good for you Tighten. You'll stay out of Montrosity. - You got it! - Good! Pretty sneaky, sis. But there is only one person I know who calls this town, Montrosity. Ooops. You! Bet you think it's really funny, huh? (..)2010 Megamind